Jakarta jolted by 6.5 magnitude quake, tremors felt across Indonesia’s Java and Sumatra
BMKG Earthquake and Tsunami Director Dr Wijayanto said the magnitude 6.5 earthquake struck at 4.23am, with its epicentre located 69km north-east of Jakarta’s Thousand Islands in the Java Sea at a depth of 368km. — Social media pic
Summary
- A magnitude 6.5 earthquake struck near Jakarta's Thousand Islands, felt across Java and Sumatra, with no tsunami threat reported.
- The earthquake, originating in the Java Sea, occurred at a depth of 368 kilometres and was caused by intraslab activity.
- Commuter Line services in affected areas were temporarily suspended for safety inspections, with services resuming shortly after.
First Published: Saturday, 12 Sep 2026 1:28 PM MYT
JAKARTA, Sept 12 — A magnitude 6.5 earthquake struck near Jakarta’s Thousand Islands (Kepulauan Seribu) early Saturday, with tremors felt in the Indonesian capital and across parts of Java and Sumatra.
Meteorology, Climatology, and Geophysics Agency (BMKG) Earthquake and Tsunami Director Dr Wijayanto said the earthquake struck at 4.23am local time, with the magnitude revised from an initial 5.9 following further analysis.
He said its epicentre was in the Java Sea, 69 kilometres north-east of Jakarta’s Thousand Islands, at a depth of 368 kilometres.
“Taking into account the location of the epicentre and the depth of its hypocentre, the earthquake was a deep earthquake caused by intraslab activity,” he said in a statement, adding that tsunami modelling showed no tsunami threat.
The earthquake came less than 10 hours after a magnitude 6.0 quake struck the Banda Sea in eastern Indonesia at 6.56pm on Friday at a depth of 148 kilometres, with its epicentre 162 kilometres northeast of South-west Maluku and tremors felt across parts of Maluku.
Wijayanto said the strongest tremors from Saturday’s earthquake were reported in parts of Banten and West Java, as well as Tanggamus in southern Sumatra, where the shaking was perceptible by people indoors and could cause windows and doors to rattle.
He said the tremors were also clearly felt indoors in Jakarta’s Tanjung Priok and several other areas, while weaker shaking was reported as far away as Yogyakarta and Malang in Java, and Padang and the Mentawai Islands in western Sumatra.
Some of strongest tremors were reportedly felt in Pandeglang in Banten, which lies along the Sunda Strait near the Anak Krakatau volcano which experienced renewed eruptive activity last week. However, Wijayanto said, Saturday’s earthquake was tectonic in origin, with BMKG reporting no aftershocks as of 5am.
Meanwhile, KAI Commuter said in a social media post that Commuter Line services were suspended following the earthquake to allow comprehensive inspections of railway tracks.
It said the Bogor, Cikarang, Rangkasbitung, and Tanjung Priok lines resumed services after inspections were completed at 5.26am, followed by the Tangerang line at 5.45am. — Bernama
One is food for thoughful reflection, another is Chicken Little running through town.
ReplyDeleteEven if it is sinking, what is that to you and me?
https://x.com/singaaaaaaaaaaa/status/2098631585935524211
An ultra-deep earthquake at a depth of 742 km is an extremely rare occurrence.
This depth surpasses the main boundary of the mantle's transition zone, around 660 km. If confirmed, this phenomenon is intriguing for further research.
Cc: @daryono_eq_talk
https://x.com/WaynesAwake/status/2098535298472775711
Sunda plate is sinking……
the prophesized big ONE is coming!
DeleteNot just the Sunday. The whole of pacific ring of fires is playing up.
https://www.tempo.co/lingkungan/kenapa-bmkg-khawatirkan-megathrust-2069853
ReplyDeleteKenapa BMKG Khawatirkan Megathrust
BMKG menyatakan bahwa Indonesia masih menghadapi ancaman gempa besar di zona megathrust di beberapa titik wilayah.
15 September 2025 | 09.11 WIB
AI generated respinses based on query terms "earth plates indonesia archipelago" in brave browser.
ReplyDeleteIndonesia’s archipelago sits at the complex intersection of four major tectonic plates: the Indo-Australian Plate, Eurasian Plate (including the Sunda Plate), Pacific Plate, and Philippine Sea Plate. These plates converge along the archipelago's boundaries, creating a highly active geological environment characterized by subduction zones, volcanic arcs, and frequent seismicity.
Key Plate Interactions
Indo-Australian and Eurasian Plates: The Indo-Australian Plate subducts northwestward beneath the Eurasian Plate along the Sumatra-Java Trench at a rate of 3–10 cm/year, forming the primary volcanic arc in western Indonesia.
Pacific and Philippine Sea Plates: These plates interact with the Eurasian and Indo-Australian plates in eastern Indonesia, particularly around New Guinea and the Molucca Sea, where collision and subduction create complex deformation zones like the Banda Arc.
Microplates: Smaller blocks, such as the Sunda Shelf, East Sulawesi, and Bird’s Head blocks, rotate and move independently relative to the major plates, further complicating the regional tectonics.
This convergence of multiple plates makes Indonesia one of the most seismically and volcanically active regions on Earth.
AI-generated answer. Please verify critical facts.
https://x.com/indepenSumatera/status/2098622609726607782
DeleteMEGATHRUST JAWA-SUMATRA
NO TRIGGER NEEDED TO ERUPT! REAL POTENTIAL ISN'T JUST EMPTY TALK
There's a lot of buzz about the link between the Thousand Islands earthquake and the threat of Megathrust reactivation along the West Coast of Sumatra and South Java. Let's set the record straight scientifically so the public doesn't get trapped in disinformation, but stays on high alert—one level of vigilance, folks!
Based on reviews of seismology and plate tectonics (Stein, 1999; Widiyantoro et al., 2020), the shallow/mid-depth local quake in the Thousand Islands DOES NOT activate the Sumatra or Java Megathrust zones. They operate in entirely different geological systems!
But this is NO reason to relax—why? Because the Megathrust along the West Sumatra and South Java coasts has indeed been independently accumulating massive energy every single second!
Let's break down the scientific facts and the real threats on the ground, folks.
1. System Differences
Intraplate vs Interplate Subduction
The Thousand Islands quake is within the Sundaland plate/Intraplate, while the Megathrust is the sharp boundary where the Indo-Australian Ocean Plate dives under Java/Sumatra (5–7 cm/year). The static stress transfer from small local quakes isn't strong enough to wake the Megathrust giant that's hundreds of kilometers away!
2. SEISMIC GAP Threat in Mentawai Megathrust & South Java
Scientific studies in Nature Scientific Reports (Widiyantoro et al., 2020) confirm the buildup of unreleased shear deficit along the south Java coast and Mentawai-Siberut. This locked energy has the potential to trigger a magnitude 8.7 - 9.0 megathrust quake that could unleash towering tsunami waves!
3. Poor Preparedness in Mitigation & Coastal Spatial Planning
Our main focus shouldn't be lamenting rumors, but questioning: How ready are local and central governments in providing evacuation routes, active early warning systems, and coastal infrastructure resilience? Megaprojects keep rolling out, but coastal community mitigation education often gets sidelined, folks!
4. Urgent Call to Action for West Sumatra & South Java Coastal Regional Governments
Local governments from Aceh, West Sumatra, North Sumatra, Bengkulu, Lampung, Banten, West Java, Central Java, to East Java must allocate real budgets for regular disaster simulations, tsunami siren maintenance, and safe settlement zoning along the coast!
Geological disasters can't be prevented, but the loss of tens of thousands of lives due to mitigation negligence and dull early warning systems CAN and MUST be avoided!
How are the tsunami siren facilities and evacuation routes in your coastal areas right now? Functional or just for show?
Is there some kind of co-incidence that the kelas pemerintah seems to suffer some king of mad paralysis in handling the crisises confronting Indonesia now versus the situation with forest burning in Kalimantan and elsewhere, earthquakes, volcanoes, scandalous mbg policy and declining confidence of the investment class?
ReplyDeletehttps://x.com/kittenclaay/status/2098532230658474344
guys, do you guys feel like you need to prepare an emergency bag from now on or whatever?
I’m starting to want to prepare an emergency bag because I’m so scared that the megathrust earthquake might happen huhu
call me fomo, but I’m getting so anxious
https://x.com/atokdalangs4/status/2098335968680202393
JUST FOUND OUT FIRE CAN TELL THE DIFFERENCE BETWEEN FOREST AND PALM PLANTATION 😭😭😭
The entire plate subduction zone near Krakatau , Java and Southern Sumatra appears to be waking up.
ReplyDelete