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The earthquake occurred in a region within a faulting zone known as the Cotabato fault system, which is a seismically active region due to the presence of several active faults, including the NW-SE trending Makilala-Malungon, M'lang, North and South Columbio and Tangbulan faults, and the SW-NE trending Makilala and Balabag faults.
The first event is interpreted to have ruptured the M'lang Fault, the second the Makilala Fault, the third the Balabag Fault and the last the Makilala-Malungon Fault. The observed sequence of earthquakes rupturing orthogonal strike-slip fault sets has been compared to the 2019 Ridgecrest earthquake sequence. [9]
The maximum perceived shaking was VII on both the PEIS and MMS scales. This intensity was reached in Tulunan, Makilala, Kidapawan City, Digos, and Malungon. This earthquake was caused by movement on a different, but related, strike-slip fault to the October 16 event. [34] [35] Magnitude 6.6 [36]
The earthquake came from an area that produced a similar sequence of earthquakes in October 2019 and December 2019 [citation needed], within an active faulting zone known as the Cotabato fault system, which includes the NW-SE trending Makilala-Malungon, M'lang, North and South Columbio and Tangbulan faults, and the SW-NE trending Makilala and ...
Large numbers of earthquakes of smaller magnitude occur very regularly due to the meeting of major tectonic plates in the region. Based on the records of the USGS, Indonesia has had more than 150 earthquakes with magnitude > 7 in the period 1901–2019.
Ten deadliest recorded earthquakes in the Philippines since the 1600s Magnitude Location Date Deaths Missing Injured Damage Source 1 8.0 Moro Gulf: August 16, 1976 4,791 2,288 9,928 2 7.8 Luzon Island: July 16, 1990 1,621 1,000 >3,000 ₱ 10 billion 3 Unknown Manila: June 3, 1863 1,000 [11] 4 7.5 Luzon Island: November 30, 1645 >600 >3,000 ...
Date Region Mag. MMI Deaths Injuries Comments Ref 2023-12-02 Chittagong: 5.5 M w : VI 0 200+ Minor damage [1]2021-11-26 Chittagong: 6.2 M w : VIII 0 5 Slight damage
The list incorporates high-quality earthquake source (i.e., origin time, location and earthquake magnitude) and fatality information from several sources. Earthquake locations are taken from the Centennial Catalog [ 1 ] and the updated Engdahl, van der Hilst and Buland earthquake catalog, [ 2 ] which is complete to December 2005.