Minor Johor Quakes Stress Need For Fault Line Remapping Monitoring

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A series of minor earthquakes that have struck Johor since Sunday has highlighted the urgent need to intensify remapping and monitoring of active and ancient fault lines in Peninsular Malaysia.
Disaster Management Programme coordinator and senior lecturer at Elmu University, Rabieahtul Abu Bakar, said particular attention should be given to the Mersing Fault, as well as ancient fault lines such as Bukit Tinggi, Bentong–Raub and Kenyir.
She emphasised that a comprehensive study of these faults must incorporate advanced technologies, including 3D mapping and micro-seismic zonation, to determine the actual risk levels in affected areas.
“A high-density seismometer network, along with GNSS (Global Navigation Satellite System) and Insar (Interferometric Synthetic Aperture Radar), should be deployed to detect micro-deformation in the earth’s crust, particularly for urban microzonation, as recommended by seismic experts.
“In addition, the national seismic hazard map and building design parameters must be updated. For instance, the peak ground acceleration (PGA) values should be revised based on the 2025 Segamat incident,” she told Bernama today.
Structural compliance crucial
Rabieahtul further stressed that building structures must comply with the Malaysian adaptation of Eurocode 8 (MS EN 1998), which has been widely adopted since the 2015 Ranau earthquake.
“Critical structural audits should also be carried out, particularly on schools, hospitals, mosques and bridges. Where necessary, strengthening or retrofitting works must be undertaken.
“Effective implementation requires close coordination between the Minerals and Geoscience Department, the Meteorological Department, Public Works Department and local authorities,” she said.
The epicentre of the minor earthquake that struck Segamat todayShe added that a free-broadcast early warning system should be developed, including the installation of sirens at potential quake-prone sites identified through geospatial mapping, as well as a rapid notification system capable of providing timely alerts to the public.
Citing data from the United Nations Office for Disaster Risk Reduction (UNDRR), Rabieahtul said that every US$1 (RM4.22) invested in disaster risk reduction and preparedness could save up to US$15 in post-disaster recovery costs.
She also urged Malaysia to move towards becoming a nation that is proactively prepared rather than reactive, before disaster strikes.
She advised parents to identify the nearest evacuation sites and guide their children on safety measures, such as covering their heads with a helmet or a hard book, avoiding the use of lifts, and carrying a prepared emergency kit in case of evacuation from home.
“Teachers and schools are encouraged to provide disaster preparedness education and conduct effective evacuation drills, while children should be taught not to wait for their parents during a tremor but to move immediately to open areas for safety.
“Most importantly, the public must understand the ‘Drop, Cover, Hold On’ safety procedure - drop down, take cover under a sturdy table, hold on until the shaking stops, exit calmly after the tremor, avoid using lifts, and stay clear of cracked walls or ceilings,” she explained.
The minor earthquake that struck Segamat on Wednesday, Aug 27Earlier today, a minor 3.4-magnitude earthquake was detected in Segamat, marking the fourth such incident recorded in the district this week.
Previously, Segamat recorded three minor earthquakes on Aug 24, 27, and 28, with magnitudes ranging between 2.5 and 4.1.
- Bernama

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