Jakarta, domclub Indonesia
—
Amount
active fault
in Indonesia is increasing from year to year.Currently, there are a total of 401 active triggering faults
big earthquake
spread across the country.
Professor at the Faculty of Civil and Environmental Engineering, ITB, Masyhur Irsyam, said that the increase in the number of active faults was not because the Earth was becoming more fractured.
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“The number of active faults has increased significantly compared to the 2017 mapping. This is not because the earth is becoming more cracked, but rather our data and research are becoming more advanced,” said Msyhur in the forum “Damaging Earthquakes and Efforts to Create Earthquake Resistant Buildings with Seismic Base Isolation Technology in Indonesia” in Jakarta, Wednesday (10/12).
He explained that the updated earthquake hazard map combines more than 100,000 earthquake catalogs from the Meteorology, Climatology and Geophysics Agency (BMG), the United States Geological Institute (USGS), and the Agency for the Assessment and Application of Technology (BPPT), which has been updated until 2024.
According to him, all hypocenters were relocated using 3D models to increase the accuracy of the position and characteristics of the earthquake source.
From a geological perspective, the team led by Prof.Danny Hilman Natawidjaja conducted intensive field surveys, including trenching, carbon analysis, and geomorphological mapping using high resolution SRTM and LiDAR.
These comprehensive results mean that many previously unconfirmed faults are now declared active and finally entered the national map.
“Overall, the number of new active fault earthquake sources increased to 401, much greater than in 2017,” said Masyhur.
In detail, the spike in the number of active faults rose from 52 to 401 in 14 years.The map update shows a huge upward trend:
2010: 52 active faults
2017: 272 active faults
2024: 441 active faults
The 2024 Indonesian Earthquake Source and Hazard Map published by the Ministry of Public Works also reveals that this addition comes from more detailed geological, geodetic and seismological surveys, as well as strengthening the BMKG sensor network.
Referring to the latest map, the islands of Java and Sumatra experienced the largest spike in active faults.Here are the details:
Java: Fault segments increased from 36 (2017) to 82 (2024).The most striking discoveries were in northern Java, from Surabaya-Semarang-Cirebon-Bandung to near Jakarta.
Sumatra: From 56 segments (2017) to 86 segments (2024).Includes updates to the Sumatran Fault and Toru fold-thrust belt.
Nusa Tenggara-Banda: Increased by 21 segments to 68 segments.
Sulawesi: There are 77 active faults recorded.The already complex fault network is now even more detailed with the latest update.
Kalimantan: From only 3 segments (2017) there are now 10 segments, including in the Archipelago Capital region (IKN).
Maluku-Papua: Slightly decreased from 80 to 78 segments due to rearrangement of the Seram Fault segmentation.
This new map confirms that Indonesia is in one of the most tectonically active regions in the world.Apart from large subduction zones in Sumatra, Java and NTT, the existence of increasingly detailed shallow fault networks shows the potential for damaging earthquakes to occur in many areas previously considered safer.
In northern Java, for example, the identification of new structures underscores the potential for earthquakes in densely populated areas that had previously been considered relatively stable.Meanwhile in Sulawesi, the interaction of the Palu-Koro, Matano, Walanae faults and other structures creates a very complicated tectonic system.
He emphasized that the addition of active faults would have an impact on increasing the seismic hazard value in many areas.This new finding is the basis for improving various construction standards, including SNI 1726 for earthquake-resistant buildings.
“The increase in the number of earthquake sources will certainly increase the danger and risk values in the future,” he said.
(wpj/dmi)
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