The 5.6 magnitude tectonic earthquake that rocked Cianjur, West Java, on Monday (21/11) caused many deaths and damaged houses. The Disaster Management Agency (BNPB) reported that there were 103 mental victims in Cianjur Regency.
The Meteorology, Climatology and Geophysics Agency (BMKG) said that the cause of the Cianjur earthquake was the activity of the Cimandiri fault. The earthquake in Cianjur was classified as a shallow earthquake and had no potential for a tsunami.
However, the magnitude of the shocks and aftershocks made many houses badly damaged. Teguh Rahayu, Head of the Bandung BMKG Geophysics Station, revealed that the number of aftershocks in this earthquake was 125 times as of November 22 morning. Aftershocks occurred in varying strength, the largest with a magnitude of 4.2 to 1.5.
BMKG stated that the cause of the Cianjur Earthquake was the movement of the Cimandiri Sesar. The Cimandiri fault is an active sliding fault or fault along approximately 100 km.
The location of the Cimandiri fault itself extends from the mouth of the Cimandiri River at Pelabuhan Ratu, Sukabumi Regency, heading northeast through Cianjur, West Bandung, and Subang. The Cianjur earthquake last Monday was centered around Sukabumi -Cianjur due to a sliding fault.
Daryono, Head of BMKG Earthquake and Tsunami, said several areas in western Java are prone to earthquakes because they are in active and complex seismic areas. These areas include Bandung, Lembang, Sukabumi, Purwakarta.
"If this tectonic complexity triggers, it has the potential to trigger shallow crustal earthquakes orUAL crude earthquake, this kind of tectonic fact becomes an earthquake-prone area permanently, and with the characteristics of this shallow crustal earthquake", said Daryono.
The earthquake in Cianjur was classified as an earthquake that was quite severe because it claimed many lives and caused severe damage to houses. The number of victims who died in Cianjur Regency was 103 juwa. The injured victims were 377 people. Meanwhile, the number of displaced residents increased to 7,060 people.
The shocks that occurred on Monday afternoon and after that caused many houses to be badly damaged. A total of 3,075 houses suffered minor damage. A total of 33 houses were moderately damaged, and 59 houses were heavily damaged.
The Geological Agency of the Ministry of Energy and Mineral Resources conveyed that the morphology of the epicenter of the earthquake in Cianjur was generally in the form of islands to corrugated mountains, bumpy hills, and steeply in the southeast of Mount Gede.
The earthquake-affected area was composed of quaternary deposits in the form of ancient and alumcial volcanic forecasts. In addition, some of the volcanic rock has also experienced weathering. This condition has the potential to strengthen the effects of shocks and soil movement.
The Geological Agency said that the earthquake that occurred in Cianjur has the potential to cause surface fault hazard hazards in the form of soil cracks, soil movements, land subsidence, and liquefaction.
Meanwhile, the Head of the BMKG Earthquake, said there were several factors that caused high casualties and rioting. First, the depth of the earthquake point is shallow. Second, the structure of the building does not meet the earthquake safe standards. Third, the location of the settlement is on soft soil and hills.
That is the cause of the Cianjur earthquake and the factor that many victims and houses were badly damaged. The Cianjur area has earthquake-resistant soil conditions. Not only residents' houses, several infrastructures were damaged by the earthquake, such as damaged government buildings, Cianjur Hospital, places of worship and others.
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