1704882832
CNN Indonesia
Monday, January 8, 2024 6:58 p.m. IWST
Illustration. The BMKG managed to identify a new fault called the Sumedang fault, which was behind the Sumedang earthquake on December 31, 2023. (Photo: iStockphoto/Armastas)
Jakarta, CNN Indonesia —
The Office for Meteorology, Climatology and Geophysics (BMKG) has managed to identify a new fault called Sumedang error Who is the mastermind? earthquake Sumedang on December 31, 2023. This new fault is said to have never been mapped before.
The Sumedang area was previously hit by an M4.8 earthquake with the epicenter at the coordinates 6.85 degrees south latitude and 107.94 degrees east longitude, exactly on land at a distance of 2 kilometers northeast of the center of the Sumedang City, West Java, with the depth of the earthquake epicenter (hypocenter) being 5 kilometers from the Earth’s surface.
According to BMKG analysis, the earthquake started with two foreshocks that occurred at 14.35 WIB with a magnitude of M4.1 and at 15.38 WIB with a magnitude of M3.4, followed by several aftershocks with magnitudes between M2.4 and 2.4 M4. 5.
According to the BMKG, this earthquake was an earthquake with a thin crust (Earthquakes in the Earth’s shallow crust) due to active fault activity, with the swelling mechanism resulting from a combination of horizontal and upward movements (Oblique thrust fault), running in a north-south direction.
“Let us pay attention to the distribution of aftershocks, the tectonic order (tectonic environment“) and analysis of the mechanism of origin, the earthquake was caused by an active fault that passed through the city of Sumedang and was not previously mapped; according to BMKG seismicity data analysis, it will henceforth be called the Sumedang fault,” BMKG head Dwikorita Karnawati said in a statement , Monday (Jan 8).
Dwikorita explained that the Sumedang regency is an earthquake-prone area, with the source of the earthquake lying in the collision zone of the Indo-Australian and Eurasian plates in the Indian Ocean. In addition, earthquakes also originate from several active land faults that have been mapped such as the Cimandiri Fault, Cugenang Fault, Lembang Fault, Cipamingkis Fault, Garsela Fault, Baribis Fault, Cicalengka Fault, the Cileunyi-Tanjungsari fault, the Tomo fault and other Cipeles faults, as well as several other active faults that have not been mapped.
According to the BMKG’s Catalog of Destructive Earthquakes (2020), Dwikorita continued, there have now been two devastating earthquakes in the Sumedang area, on August 14, 1955, which caused extensive damage to buildings, and on December 19 1972 with a magnitude of M4.5, causing building damage and landslides.
“The December 31, 2023 earthquake was felt not only in Sumedang and Bandung regencies, but also in Bandung city, Sumedang and Garut regencies,” Dwikorita said.
In addition, Dwikorita said the BMKG has coordinated with the Sumedang Regency Regional Government (BPBD), BNPB, SAR and the Ministry of Social Affairs to reassure residents by providing earthquake literacy/awareness as well as mitigation and self-rescue measures that must be taken beforehand, during and after an earthquake. .
BMKG has also conducted surveys and a series of studies ranging from seismicity surveys, macroseismic surveys, microzonation surveys, deformation surveys, aerial lidar photography, morphotectonic assessments and subsurface fault structure surveys.
“These surveys were carried out to map the activity and distribution of earthquakes and to find out the main causes of earthquakes in detail, including the identification and validation of fault lines,” explained Dwikorita.
(lom/dmi)
Watch the video below:
#BMKG #finds #fault #Sumedang #earthquake #mapped