TEMPO.CO, Jakarta - The Meteorology, Climatology and Geophysics Agency (BMKG) explained the 7.4-magnitude earthquake that hit Banten last night, August 2, was caused by the subduction of the Indo-Australian plate under the Eurasian plates.
"The United States Geological Survey (USGS) records the earthquake at coordinates 104,806° East and 7.29° South with a magnitude of 6.8 at a depth of 42.8 km," Head of the Volcanology and Geological Disaster Mitigation Center (PVMBG) of the Ministry of Energy and Mineral Resources (ESDM) Kasbani said in a statement on Friday night, August 2.
The quake occurred at 19:03 local time. The epicenter was located at coordinates 104.58 degrees east longitude and 7.54 degrees south latitude, with a magnitude of 7.4 at a depth of 10 km, 137 km southwest of Sumur, Banten.
The center of the quake was in the sea. The area bordering the epicenter is the southern coastal areas of Banten, West Java and Lampung, which are composed by sediment rocks from Quaternary period.
The Quaternary rocks were weathered and therefore the structures were loose and broken. These characteristics led to the strengthening of the earthquake shocks. The tremors were felt in Java from Jakarta to East Java.
BMKG has revoked the early warning of the potential tsunami at 21:41 before previously it was issued with the alert status (siaga) in South Pandeglang and southern coastal areas of Lampung and an alert status in North Pandeglang, Lebak, western coastal areas of Lampung, and the coastal areas in Bengkulu.