JOHOR BAHRU, Nov 4 — A minor earthquake measuring 2.7 on the Richter scale recorded in Jementah, Segamat at 7.55pm yesterday is evidence of ancient volcanic activity in the Segamat area, particularly around Jementah and Batu Badak, said the Minerals and Geoscience Department (JMG).
It said the tremor occurred within the ancient Tertiary volcanic zone, an area that experienced volcanic activity millions of years ago.
According to the Malaysian Meteorological Department (MetMalaysia), the earthquake’s epicentre was at 2.5°N, 102.8°E, roughly three kilometres west of Segamat, with a depth of about 10 kilometres.
“An analysis using the Malaysian Geological Map (MyGEMS - JMG) shows that the area is composed of lava flows and late Tertiary rock deposits, including shale, sandstone, conglomerates, and minor coal layers,” JMG said in a statement.
These geological characteristics confirm that Segamat, particularly around Jementah and Batu Badak, was once a site of ancient volcanic activity and is now classified as a modified volcanic zone.
It noted that yesterday’s tremor was not the first in the area, as a 4.1-magnitude earthquake had previously been recorded nearby, highlighting a recurring pattern of micro-seismic activity along the fault line.
“Both events were centred in the Tertiary volcanic zone of Segamat and suggest a possible reactivation of tectonic stress on ancient rocks due to adjustments in the Earth’s crust,” JMG said.
The minor earthquake was classified as a shallow, local tremor and posed no significant threat to public safety or structures, although it was felt in Segamat and nearby areas.
