Southeast Asia Earthquake Tracker โ Live Earthquakes
By Paul Harrison | Founder & Publisher, Orbis Weather
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Southeast Asia Earthquakes This Week: Friday, October 30, 2026
ยท @Paul
By Paul Harrison, Orbis Weather
The strongest earthquake in Southeast Asia by the United States Geological Survey (USGS) count this week struck the Philippine Sea off Surigao del Sur, Mindanao, at 11:19 PHT on Thursday 29 October. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) put it at magnitude 5.9; USGS measured 5.8. Indonesia’s agency BMKG recorded the week’s largest figure, magnitude 6.2 (first reported as 6.4), for a quake 164 km deep under the Banda Sea on the same morning; USGS measured 5.7. Neither caused a tsunami, and no damage was reported from either.
The most disruptive events were a pair of quakes off Sarangani province on Wednesday 28 October, which led the province to suspend classes and government work for safety checks. A magnitude 5.1 quake south of Yogyakarta on Tuesday night was felt lightly across 14 districts of Java. The only damage found this week was one lightly damaged house after small quakes in Tanggamus, Lampung. This report is current to 05:58 WIB on Friday 30 October in Jakarta and Bangkok (UTC+7), 06:58 in Manila, Makassar and Singapore (UTC+8), and 18:58 EDT on Thursday 29 October in the US East.
Key facts
Item | Figure | Source |
|---|---|---|
Period covered | 00:00 UTC Fri 23 Oct to 22:58 UTC Thu 29 Oct 2026 | USGS query time |
Quakes of M4.5+ in Southeast Asia and the Andaman Sea | 25 | USGS |
Largest by USGS | M5.8, Philippine Sea off Surigao del Sur, 29 Oct | USGS |
Largest by BMKG | M6.2 (first 6.4), Banda Sea, 164 km deep, 29 Oct | BMKG |
Largest in the Philippines | M5.9 off Lingig, Surigao del Sur, 29 Oct | PHIVOLCS |
Strongest shaking reported | Intensity V in Lingig, 29 Oct | PHIVOLCS via GMA News |
Tsunami | None; BMKG modelling showed no tsunami potential for its M5+ events | BMKG |
Deaths or damage | No deaths; one house lightly damaged in Tanggamus, Lampung | Prioritas TV |
Latest felt quake | M5.0, Bay of Bengal off the Andaman Islands, 14:19 IST 29 Oct; mild tremors in North and Middle Andaman | NCS India, Daijiworld |
This week’s earthquakes of magnitude 4.5 and above
USGS recorded 25 quakes of magnitude 4.5 or more in Southeast Asia and the Andaman Sea this week. The 15 largest are listed below, newest first.
Local date and time | USGS magnitude | USGS location (area) | Depth (km) |
|---|---|---|---|
Fri 30 Oct, 05:32 WIT | 5.0 | 131 km NNW of Tual, Indonesia (sea off Tual, Maluku) | 10 |
Thu 29 Oct, 14:19 IST | 5.1 | 218 km NNW of Bamboo Flat, India (Bay of Bengal west of the Andaman Islands) | 10 |
Thu 29 Oct, 15:31 PHT | 5.4 | 114 km ENE of Barcelona, Philippines (Philippine Sea off Surigao del Sur) | 10 |
Thu 29 Oct, 11:19 PHT | 5.8 | 110 km ENE of Barcelona, Philippines (Philippine Sea off Surigao del Sur) | 10 |
Thu 29 Oct, 11:17 PHT | 5.4 | 113 km ENE of Barcelona, Philippines (Philippine Sea off Surigao del Sur) | 10 |
Thu 29 Oct, 07:06 WIT | 5.7 | 271 km WSW of Tual, Indonesia (Banda Sea, northwest of Tanimbar) | 142 |
Thu 29 Oct, 04:56 WIT | 5.3 | 159 km WNW of Tobelo, Indonesia (northern Molucca Sea) | 35 |
Wed 28 Oct, 20:14 PHT | 4.9 | 1 km WSW of Butulan, Philippines (off Sarangani, Mindanao) | 10 |
Wed 28 Oct, 09:11 PHT | 5.2 | 6 km NW of Balangonan, Philippines (off Sarangani, Mindanao) | 46 |
Wed 28 Oct, 07:43 PHT | 5.1 | 7 km N of Balangonan, Philippines (off Sarangani, Mindanao) | 58 |
Wed 28 Oct, 00:07 PHT | 4.9 | 70 km WNW of Callaguip, Philippines (sea off Ilocos Norte, Luzon) | 10 |
Tue 27 Oct, 21:44 WIB | 5.4 | 126 km S of Pundong, Indonesia (Indian Ocean south of Yogyakarta) | 10 |
Tue 27 Oct, 21:43 WIB | 4.9 | 156 km S of Pundong, Indonesia (Indian Ocean south of Yogyakarta) | 21 |
Mon 26 Oct, 12:53 WITA | 5.0 | 45 km NNW of Ende, Indonesia (Flores Sea, East Nusa Tenggara) | 10 |
Sun 25 Oct, 06:41 WIT | 4.9 | 53 km NNW of Fef, Indonesia (Southwest Papua) | 10 |
Source: USGS catalogue query, generated 22:58 UTC on 29 October 2026. The search box also caught events near Japan’s Bonin Islands (largest M6.5, 492 km deep), Taiwan, northeast India, southern China and an M5.7 in Papua New Guinea; these are excluded. For the M5.8 off Surigao del Sur, USGS notes its 10 km depth was assigned rather than measured.
Times: WIB is UTC+7, WITA UTC+8, WIT UTC+9, PHT UTC+8 and IST UTC+5:30.
The week’s notable quakes
Philippine Sea off Surigao del Sur, 29 October. PHIVOLCS placed the main shock 104 km northeast of Lingig at a depth of 2 km. Its list shows an M4.2 in the same minute and an M4.3 at 11:33 PHT. GMA News, citing PHIVOLCS, reported an M5.6 at 15:31 PHT and felt intensity V in Lingig, III in Bislig City and II in Tandag City. PHIVOLCS expected no damage but warned of aftershocks. USGS gives M5.8, with an M5.4 a minute earlier and another M5.4 in the afternoon. Its PAGER system issued a green alert, estimating about 10,050 people felt intensity IV shaking.
Banda Sea northwest of Tanimbar, 29 October. BMKG first reported M6.4 at 05:06 WIB (07:06 WIT), then updated it to M6.2 at 164 km depth, about 203 km northwest of Tanimbar. It called the quake an intermediate-depth event from deformation within a plate, with an oblique normal mechanism. Shaking reached MMI III in Banda Naira, Tanimbar, Kaimana and Sorong. “Hasil pemodelan tsunami menunjukkan bahwa gempa bumi ini tidak berpotensi tsunami” (“Tsunami modelling shows this earthquake has no tsunami potential”), said BMKG earthquake and tsunami director Wijayanto, as quoted by iNews. USGS measured M5.7 at 142 km depth, with a green PAGER alert.
Sarangani, Mindanao, 28 October. PHIVOLCS recorded M5.1 at 07:43 PHT and M5.0 at 09:11 PHT, both south of Glan at 15 to 18 km depth. GMA reported felt intensity III in General Santos, Kiamba, Malapatan, Malungon and Tupi, and instrumental intensity IV in Alabel. PHIVOLCS director Teresito Bacolcol told GMA they were aftershocks of the June magnitude 7.8 offshore Sarangani quake, linked to the Cotabato Trench. BMKG measured the larger shock at M5.3, felt at MMI III on Indonesia’s Marore and Miangas islands. USGS gives M5.1 and M5.2. An M4.5 followed at 20:14 PHT.
South of Yogyakarta, Java, 27 October. BMKG first reported M5.4 at 21:43 WIB, then revised it to M5.1, 10 km deep and 166 km southwest of Gunungkidul. BMKG attributed it to subduction of the Indo-Australian plate, with an oblique thrust mechanism. It was felt at MMI II in 14 districts, including Bantul, Sleman, Klaten and Blitar. BMKG counted four aftershocks by 22:20 WIB, the largest M4.9. USGS lists M5.4 and M4.9.
Smaller Indonesian events. BMKG measured M4.9 for the USGS M5.3 in the northern Molucca Sea, and M4.9 for the USGS M5.0 off Flores. The Flores quake was felt at MMI III in Ngada, Sikka and Manggarai. BMKG linked it to the aftershock sequence of the 15 August 2026 M7.7 Flores earthquake, which it said had produced 23,159 aftershocks by 26 October (Minanews). An M5.0 struck off Tual at 05:32 WIT on Friday 30 October.
Elsewhere. India’s National Center for Seismology put Thursday’s Andaman event at M5.0 (USGS 5.1); Daijiworld reported mild tremors in North and Middle Andaman. Timor-Leste had no quake of M4.0 or more centred in its territory. Myanmar’s weather department issued eight minor-quake bulletins, the largest M4.7 near Lahe, with no felt reports. Thailand’s Meteorological Department listed no felt quakes in Thailand. In Vietnam, an M3.5 quake in Quang Ngai on 26 October was clearly felt by residents, Suckhoedoisong reported. Laos had a USGS M4.2 near Sainyabuli on 24 October (02:31 local time, UTC+7). No felt quakes were found for Malaysia, Singapore or Brunei.
Damage, casualties and tsunami status
No deaths or injuries were reported from any quake in the region this week, and no tsunami was generated.
- Tanggamus, Lampung (28 October): an M3.9 and an M4.1 shallow quake, followed by 24 smaller ones, lightly damaged one house in Pekon Argopeni, Sumberejo, Prioritas TV reported on 29 October. BMKG attributed them to an active fault.
- Sarangani (28 October): the provincial government suspended classes at all levels and government work for post-quake safety inspections, the Philippine News Agency reported the same day. No damage was reported.
- Gunungkidul (27 October): “Kondisinya aman karena hingga siang ini tidak ada laporan kerusakan yang masuk ke BPBD” (“Conditions are safe, as no damage reports had reached the disaster agency by midday”), Gunungkidul disaster agency head Purwono told Harian Jogja on 28 October.
- Tsunami: BMKG stated each of its magnitude 5 and above events this week had no tsunami potential. USGS set no tsunami flag for any Southeast Asian event.
Why Southeast Asia has so many earthquakes
This week’s quakes sit on the plate boundaries that ring the region. South of Java, the Indo-Australian plate sinks beneath the Eurasian plate along the Sunda megathrust, a fault about 5,500 km long; BMKG tied the Yogyakarta quake to this subduction. Under the Banda Sea, BMKG said the M6.2 came from deformation within a plate, which iNews identified as the Indo-Australian plate. Off Mindanao, BMKG and PHIVOLCS both linked the Sarangani quakes to the Cotabato Trench. The Surigao del Sur sequence struck east of Mindanao, where the Philippine Trench runs for about 1,320 km, according to Wikipedia. USGS classes quakes 0 to 70 km deep as shallow, 70 to 300 km as intermediate and 300 to 700 km as deep. USGS also stresses that magnitude is one number for a quake’s size, while intensity varies from place to place.
What to watch
- Surigao del Sur offshore cluster: PHIVOLCS listed further small aftershocks after Thursday’s M5.9 and said more are possible.
- Sarangani and the Cotabato Trench: PHIVOLCS says residents should expect occasional aftershocks from this year’s large offshore quakes, weakening over time.
- Flores aftershocks: BMKG’s count from the August M7.7 quake passed 23,000 this week, including Monday’s felt M4.9.
- Volcanic earthquakes: Semeru in East Java remains at Level III, with 79 eruption earthquakes recorded on 28 October, Antara reported via Koran Jakarta.
- Official channels: BMKG (bmkg.go.id) and PHIVOLCS (earthquake.phivolcs.dost.gov.ph) issue the authoritative magnitudes and any tsunami warnings.
About this article
This article summarises published agency data and news reports; it is not an official warning. The week runs from 00:00 UTC on Friday 23 October to the USGS query at 22:58 UTC on Thursday 29 October, within a box from 12ยฐS to 29ยฐN and 91ยฐE to 142ยฐE. Agencies use different station networks and methods, so their magnitudes, depths and locations differ. BMKG issues an automatic first estimate for speed, then updated parameters, which is why its figures are often revised. Felt reports and damage figures may change as assessments continue.
Glossary
- Magnitude: one number for the size of a quake. Each whole step means a tenfold larger amplitude on a seismogram, USGS says.
- Intensity (MMI or PHIVOLCS scale): how strongly shaking was felt at a given place, in Roman numerals.
- Epicentre: the point on the surface directly above where the quake began.
- Aftershock: a smaller quake that follows a larger one in the same area.
- Subduction: one tectonic plate sinking beneath another.
Frequently asked questions
What was the strongest earthquake in Southeast Asia this week? By USGS measurement, it was the M5.8 off Surigao del Sur on 29 October, which PHIVOLCS rated M5.9. BMKG’s M6.2 for the deep Banda Sea quake is the highest single figure, but USGS measured that event at M5.7.
Was there a tsunami warning? No. BMKG said its magnitude 5 and above events had no tsunami potential, and PHIVOLCS expected no damage from the Surigao del Sur quake.
Why did the Banda Sea quake cause only light shaking despite its magnitude? It began about 164 km below the sea, according to BMKG. Shaking reached only MMI III in nearby islands and in Sorong, and no damage was reported.
Why do BMKG, PHIVOLCS and USGS give different magnitudes? Each agency uses its own stations and calculation methods. BMKG also publishes a fast automatic estimate first, then an updated figure, as with the Banda Sea quake’s revision from 6.4 to 6.2.
Were the Sarangani quakes aftershocks? Yes, according to PHIVOLCS director Teresito Bacolcol, as reported by GMA News. He linked them to this year’s large offshore quakes and the Cotabato Trench.
Sources
Catalogues and bulletins (accessed 29 October 2026)
- USGS catalogue, M4.5+ this week
- USGS catalogue, M4.0+ by magnitude
- USGS catalogue, M5.5+ since 1 October
- USGS event us7000ttw3, Surigao del Sur and PAGER exposure
- USGS event us7000ttua, Banda Sea and PAGER summary
- PHIVOLCS latest earthquakes
- BMKG M5+ list; BMKG releases for Banda Sea, Papua New Guinea border, Sarangani M5.3, Sangihe M4.9, south of Yogyakarta; BMKG warning page
- India NCS earthquake list
- Myanmar DMH earthquake news, including bulletin of 23 October (Lahe)
- Thai Meteorological Department earthquakes
News
- GMA News, Surigao del Sur quakes, 29 Oct 2026
- DZRH, Lingig quake, 29 Oct 2026
- GMA News, Sarangani quakes, 28 Oct 2026
- Philippine News Agency, Sarangani suspensions, 28 Oct 2026
- iNews, BMKG on Banda Sea quake, 29 Oct 2026
- Okezone, Tanimbar quake, 29 Oct 2026
- Liputan6, Tanimbar quake, 29 Oct 2026
- Antara Yogyakarta, south of DIY quake, 27 Oct 2026
- Harian Jogja, Gunungkidul damage check, 28 Oct 2026
- Minanews, Flores aftershocks, 27 Oct 2026
- Prioritas TV, Tanggamus quakes, 29 Oct 2026
- Koran Jakarta/Antara, Semeru, 29 Oct 2026
- Daijiworld, Andaman quake, 29 Oct 2026
- Suckhoedoisong, Quang Ngai quake, 26 Oct 2026
Background
- Wikipedia, Sunda megathrust (accessed 29 Oct 2026)
- Wikipedia, Philippine Trench (accessed 29 Oct 2026)
- USGS, magnitude, energy release and shaking intensity
- USGS, determining the depth of an earthquake
๐ Latest M4.0+ Earthquakes
๐ Regional Activity โข Last 7 Days
๐ Tsunami Note
Official Sources
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๐ Southeast Asia Earthquake Tracker โ Live Earthquakes
Monitor earthquakes across Indonesia, the Philippines, Myanmar, Malaysia, Singapore, Thailand, Vietnam and surrounding areas with the Orbis Weather Southeast Asia Earthquake Tracker.
Southeast Asia lies within one of the most geologically active regions on Earth. Powerful tectonic forces surrounding Indonesia and the Philippines regularly produce earthquakes, volcanic activity and, in some circumstances, tsunamis.
The Orbis Weather tracker provides a regional view of significant earthquake activity, including recent M4.0+ earthquakes, stronger events and earthquakes carrying tsunami-related flags in the source data.
Earthquake parameters can be revised as seismic agencies analyze additional information, so always consult national authorities for official earthquake and tsunami warnings.
๐ Why Southeast Asia Has So Many Earthquakes
Southeast Asia sits near the boundaries of several major and smaller tectonic plates.
These enormous sections of Earth’s crust move slowly relative to one another.
Where plates collide, slide past each other or one plate descends beneath another, stress can accumulate in the Earth’s crust.
When that stress is suddenly released, an earthquake occurs.
Indonesia and the Philippines are particularly active because they lie along complicated plate boundaries associated with the broader Pacific Ring of Fire.
๐ฅ What Is the Pacific Ring of Fire?
The Pacific Ring of Fire is a vast zone of earthquakes and volcanoes surrounding much of the Pacific Ocean.
It extends through areas including New Zealand, Indonesia, the Philippines, Japan, Russia, Alaska and the western coasts of North and South America.
Many of the world’s active volcanoes and powerful earthquakes occur within this broad tectonic region.
Indonesia and the Philippines form important parts of this system.
๐ฎ๐ฉ Why Indonesia Has So Many Earthquakes
Indonesia is one of the most earthquake-prone countries in the world.
The country sits at the meeting point of several tectonic systems, including major subduction zones.
Along a subduction zone, one tectonic plate is forced beneath another.
These boundaries can produce powerful earthquakes when accumulated tectonic stress is suddenly released.
Indonesia’s geography โ thousands of islands spread across several active tectonic zones โ means earthquake activity can occur from Sumatra and Java through Sulawesi, the Banda Sea, Maluku and Papua.
๐ต๐ญ Earthquakes in the Philippines
The Philippines is also highly seismically active.
The country lies between major tectonic systems and contains numerous active faults and offshore trenches.
Earthquakes can occur beneath the islands or offshore.
Some offshore earthquakes may require tsunami evaluation depending on their magnitude, depth, location and fault movement.
As in Indonesia, earthquake risk varies considerably between different parts of the country.
๐ฒ๐ฒ Earthquakes in Myanmar
Myanmar has a different but still important tectonic setting.
One of its major geological features is the Sagaing Fault, a large strike-slip fault extending through much of the country.
Strike-slip faults occur where blocks of Earth’s crust move primarily horizontally past each other.
Significant earthquakes along active faults can cause intense ground shaking, particularly near populated areas.
๐ธ๐ฌ Can Singapore Experience Earthquakes?
Singapore has a much lower local earthquake hazard than Indonesia or the Philippines because it is not located directly on a major active plate boundary.
However, powerful earthquakes in Sumatra can sometimes produce noticeable shaking in Singapore.
Shaking may be particularly noticeable to occupants of taller buildings.
This does not mean Singapore has suddenly become the epicenter of an earthquake. Seismic waves from sufficiently powerful regional earthquakes can travel considerable distances.
๐ฒ๐พ Earthquakes and Malaysia
Much of Peninsular Malaysia has relatively low seismicity compared with neighboring Indonesia.
However, earthquakes in Sumatra can sometimes be felt across parts of Malaysia.
East Malaysia is closer to more active tectonic regions, and Sabah in particular has experienced damaging earthquakes.
Regional earthquake monitoring is therefore relevant even in countries that experience fewer major local earthquakes.
๐น๐ญ Earthquakes in Thailand
Thailand is not as seismically active as Indonesia, but earthquake hazards still exist.
Northern and western Thailand contain active faults, while powerful earthquakes in neighboring Myanmar can produce shaking across the border.
Earthquake risk should therefore not be considered zero simply because major events occur less frequently.
๐ป๐ณ Earthquakes in Vietnam
Vietnam generally experiences less earthquake activity than Indonesia or the Philippines, but earthquakes do occur.
Northern Vietnam and other areas contain active fault systems capable of producing seismic activity.
Offshore earthquakes elsewhere in the region may also be relevant when evaluating tsunami hazards.
๐ What Does Earthquake Magnitude Mean?
Magnitude measures the size of an earthquake at its source.
The scale is logarithmic rather than linear.
That means the difference between a magnitude 5 and magnitude 6 earthquake is much more substantial than the numbers might suggest.
Each whole-number increase represents approximately 32 times more energy release.
A magnitude 6 earthquake therefore releases roughly 32 times as much energy as a magnitude 5 earthquake.
Magnitude alone does not determine how destructive an earthquake will be.
๐ What Is an Earthquake Epicenter?
The earthquake begins underground at a location known as the hypocenter, or focus.
The epicenter is the point on Earth’s surface directly above that underground source.
Maps generally display the epicenter because it provides a convenient geographic location for the earthquake.
The strongest shaking does not necessarily occur exactly at that point.
Local geology, fault rupture direction, building construction and earthquake depth can all influence shaking.
โฌ๏ธ Why Earthquake Depth Matters
Earthquakes can occur at very different depths.
A shallow earthquake places the source of seismic energy closer to the surface and can therefore produce strong shaking near the epicenter.
Deeper earthquakes may be felt across larger areas but often produce less intense surface shaking near their epicenters than a similarly sized shallow event.
Southeast Asia experiences both shallow and very deep earthquakes because of its complex subduction zones.
โ ๏ธ What Does M4.0+ Mean on the Orbis Tracker?
The Orbis Weather regional tracker focuses primarily on earthquakes of magnitude 4.0 and above.
This helps prevent the map from becoming overwhelmed by the very large number of small earthquakes detected across such an active region.
Many M4-range earthquakes cause little or no damage.
The effects of any earthquake depend on magnitude, depth, distance from populated areas, local ground conditions and construction quality.
๐ด What Does an M6.0+ Earthquake Mean?
Magnitude 6 and larger earthquakes deserve increased attention because they have greater potential to produce damaging shaking.
That does not mean every M6 earthquake will cause a disaster.
A deep M6 earthquake far offshore may have relatively limited effects, while a shallow earthquake close to a densely populated city can be considerably more dangerous.
Location and depth always matter.
๐ Can Southeast Asian Earthquakes Cause Tsunamis?
Yes.
Southeast Asia contains several tectonic zones capable of generating tsunamis.
However, not every large earthquake produces a tsunami.
A damaging tsunami generally requires substantial displacement of ocean water. Large, shallow earthquakes beneath or near the ocean are therefore of particular concern when they involve vertical seafloor movement.
Indonesia’s BMKG operates earthquake and tsunami-warning services and publishes tsunami-related earthquake information.
๐ What Does the Tsunami Flag Mean?
The Orbis tracker identifies USGS events carrying a tsunami flag.
This requires careful interpretation.
A tsunami flag does not mean a destructive tsunami is heading toward every coastline.
It indicates that the earthquake has tsunami-related significance within the source data.
The Orbis page already correctly warns readers that official tsunami warnings and local emergency instructions should be used for large or shallow offshore earthquakes.
Keep that warning exactly in spirit.
๐ Why Offshore Earthquake Location Matters
A powerful earthquake beneath land cannot directly displace a large body of seawater in the same way as an undersea earthquake.
For tsunami generation, the type of fault movement is also important.
A large undersea earthquake involving substantial vertical displacement of the seafloor can suddenly move the water above it.
That disturbance can generate tsunami waves traveling away from the source.
Scientists therefore examine much more than magnitude when assessing tsunami potential.
๐ The 2004 Indian Ocean Tsunami
Southeast Asia’s earthquake risk was tragically demonstrated by the December 2004 Sumatra-Andaman earthquake and Indian Ocean tsunami.
The enormous undersea earthquake off northern Sumatra generated a devastating tsunami affecting coastlines around the Indian Ocean.
The disaster fundamentally changed tsunami awareness and contributed to major improvements in regional warning and monitoring systems.
It also demonstrated why people living near tsunami-prone coastlines should understand natural warning signs and official evacuation procedures.
๐ Earthquakes and Volcanoes
Indonesia and the Philippines experience both frequent earthquakes and volcanic eruptions because the same broad tectonic processes contribute to both hazards.
However, an earthquake occurring near a volcano does not automatically mean the volcano is about to erupt.
Volcanologists examine many indicators when evaluating volcanic unrest, including earthquake patterns, ground deformation, volcanic gas emissions and changes in temperature.
For Indonesian volcanic activity, visitors can use the Orbis Weather Indonesia Volcano Tracker alongside this earthquake page.
๐ What Are Aftershocks?
Aftershocks are earthquakes occurring after a larger earthquake as the surrounding crust adjusts to the new distribution of stress.
Some aftershocks can be strong enough to cause additional damage.
They may continue for days, weeks, months or longer following a major earthquake.
The largest aftershocks are especially important when buildings have already been weakened by the initial earthquake.
๐ What Is an Earthquake Swarm?
An earthquake swarm is a sequence containing many earthquakes in a relatively small area without one event necessarily dominating the sequence as a clear mainshock.
Swarm activity can occur for different geological reasons.
An earthquake swarm by itself does not mean that a major earthquake or volcanic eruption is imminent.
Scientists analyze the location, depth, frequency and other characteristics of the earthquakes to understand what may be happening.
๐ Why Earthquake Magnitudes Sometimes Change
Initial earthquake information is often preliminary.
As additional seismic stations report data and scientists refine their analysis, the estimated magnitude, depth and exact epicenter can change.
Indonesia’s BMKG explicitly warns that earthquake parameters can change during the first minutes after an event before expert review.
That is normal and does not mean the earthquake itself changed after it occurred.
It means scientists obtained a better estimate.
๐๏ธ Why Some Earthquakes Cause More Damage Than Others
Magnitude is only one factor.
Damage can depend on:
Earthquake depth โ shallow earthquakes can create intense nearby shaking.
Distance โ communities closer to the rupture generally experience stronger shaking.
Ground conditions โ soft sediments can amplify seismic waves.
Building construction โ earthquake-resistant structures generally perform better.
Duration โ prolonged strong shaking can increase damage.
Population density โ the same earthquake can have dramatically different human consequences depending on where it occurs.
๐ข Why Tall Buildings Can Feel Distant Earthquakes
Long-period seismic waves from powerful earthquakes can travel great distances.
Tall buildings can respond more noticeably to these slower oscillations than small, rigid structures.
This helps explain why people in high-rise buildings in places such as Singapore or Kuala Lumpur may occasionally report swaying from a powerful distant earthquake.
Feeling an earthquake does not necessarily mean structural damage is occurring.
๐งญ Can Scientists Predict Earthquakes?
Scientists cannot currently predict the exact time, location and magnitude of a future earthquake with the precision needed to issue conventional short-term earthquake forecasts.
Seismologists can identify active faults, estimate long-term earthquake probabilities and rapidly detect earthquakes after they begin.
Earthquake early-warning systems can sometimes provide seconds of warning after an earthquake has started but before the strongest seismic waves reach locations farther away.
That is fundamentally different from predicting an earthquake days or weeks in advance.
๐ก๏ธ What Should You Do During an Earthquake?
Earthquake safety advice can vary somewhat by country and environment, so local emergency guidance should take priority.
In many situations, people indoors are advised to Drop, Cover and Hold On โ drop to the ground, take cover beneath sturdy furniture if available and hold on until shaking stops.
Stay away from windows and objects that could fall.
After strong shaking near a tsunami-prone coastline, immediately follow local tsunami evacuation instructions.
๐ฐ๏ธ How the Southeast Asia Earthquake Tracker Works
The Orbis Weather Southeast Asia Earthquake Tracker queries the USGS Earthquake Catalog for regional seismic activity.
The USGS catalog supports filtering earthquake information by magnitude, date, geographic region and depth.
Orbis organizes that information into a simplified Southeast Asia dashboard showing recent activity, stronger earthquakes and regional groupings.
Country groupings are approximate geographic classifications based on epicenter coordinates rather than official political or seismic-agency boundaries.
๐ก Official Earthquake Sources
The USGS provides the live event data used by the current Orbis browser widget.
For Indonesia, BMKG is an essential official regional source for earthquake and tsunami information.
National geological, meteorological and disaster-management agencies should always be consulted when a significant earthquake affects a particular country.
Official authorities โ not Orbis Weather โ determine local tsunami warnings, evacuation orders and emergency actions. BMKG’s tsunami service similarly states that national, state and local authorities are responsible for official threat and warning decisions.
๐ Monitor Earthquakes Across Southeast Asia
Southeast Asia’s complicated tectonic setting makes continuous earthquake monitoring valuable.
Indonesia and the Philippines experience particularly frequent seismic activity, while earthquakes in Myanmar, Malaysia, Thailand, Vietnam and neighboring areas can also pose local or regional hazards.
Use the Orbis Weather Southeast Asia Earthquake Tracker to monitor significant seismic activity, then consult official national authorities whenever a potentially damaging earthquake or tsunami threat develops.
For additional regional monitoring, explore the Orbis Weather Indonesia Volcano Tracker, Southeast Asia Natural Hazards, Singapore Weather & Natural Hazards and Daily Southeast Asia Weather & Natural Hazards Briefing.
โ ๏ธ Important Earthquake & Tsunami Disclaimer
The Orbis Weather Southeast Asia Earthquake Tracker is provided for general information, education and situational awareness.
Earthquake magnitudes, locations and depths may initially be preliminary and can be revised as additional seismic data becomes available.
A tsunami flag displayed by the tracker does not mean a tsunami has been confirmed or that a particular coastline will be affected.
For significant earthquakes, tsunami warnings, evacuation information and emergency instructions, consult the responsible national and local authorities.
Do not use Orbis Weather alone for earthquake or tsunami life-safety decisions