Detailed Pedia

2022 West Java earthquake

2022 West Java earthquake
2022 West Java earthquake is located in Indonesia
2022 West Java earthquake
2022 West Java earthquake is located in West Java
2022 West Java earthquake
UTC time2022-11-21 06:21:10
USGS-ANSSComCat
Local date21 November 2022 (2022-11-21)
Local time13:21 IST (UTC+07:00)
Magnitude5.6 Mww
Depth11 km (6.8 mi)
Epicentre6°51′11″S 107°05′42″E / 6.853°S 107.095°E / -6.853; 107.095Coordinates: 6°51′11″S 107°05′42″E / 6.853°S 107.095°E / -6.853; 107.095
TypeStrike-slip
Areas affectedIndonesia
Max. intensityVI (Strong)
LandslidesYes
Casualties162 dead, >700 injured

On 21 November 2022, a Mww 5.6 earthquake struck near Cianjur in West Java, Indonesia. At least 162 people died and over 700 were injured. Heavy damage was reported.

Tectonic setting

Java lies near an active convergent boundary that separates the Sunda Plate to the north and the Australian Plate in the south. At the boundary, marked by the Sunda Trench, the northward-moving Australian Plate subducts beneath the Sunda Plate. The subduction zone is capable of generating earthquakes of up to magnitude 8.7, while the Australian Plate may also host deeper earthquakes within the downgoing lithosphere (intraslab earthquakes) beneath the coast of Java. The subduction zone produced two destructive earthquakes and tsunamis in 2006 and 1994. An intraslab earthquake in 2009 also caused severe destruction.

Earthquake

According to the Meteorology, Climatology, and Geophysical Agency (BMKG), the earthquake occurred at a depth of 11 km (6.8 mi), classifying it as a shallow event. It had a strike-slip focal mechanism, and is associated with seismic activity on the Cimandiri Fault or Padalarang Fault, although the exact source is undetermined. Modified Mercalli intensity V–VI was felt in Cianjur while at Garut and Sukabumi, IV–V. In Cimahi, Lembang, Bandung City, Cikalong Wetan, Rangkasbitung, Bogor and Bayah, the earthquake was felt III. By 21 November at 19:00, 62 aftershocks were recorded with magnitudes of between 1.8 and 4.2, occurring at a decreasing rate over time.

The United States Geological Survey says; the earthquake occurred at shallow depth as a result of strike slip faulting within the crust of the Sunda Plate. Focal mechanisms indicate that the rupture occurred on either a steeply dipping north-striking, right-lateral strike-slip fault, or a steeply dipping east-striking left-lateral strike-slip fault. Its location is 260 km (160 mi) northeast of the subduction zone.

Earthquakes have been recorded in Cianjur since 1844. In 1910, 1912, 1958, 1982 and 2000, earthquakes caused damage and casualties in the area. The Cimandiri Fault is a 100 km (62 mi)-long that runs along the river of the same name. It stretches from Palabuhanratu Bay to Cianjur Regency. It is a strike-slip fault with a small vertical component along the section from Palabuhanratu Bay to southeast of Sukabumi. Along with the Lembang and Baribis faults, these structures can generate damaging earthquakes.

Casualties

At least 162 people died according to the National Agency for Disaster Countermeasure (BNPB). Most of the deaths were caused by collapsing buildings. A majority were students of several Islamic schools who perished when it collapsed. More than 700 people were injured. Dozens of students were injured by falling debris at their schools. Casualty numbers are likely to rise as victims were still buried under building debris, and one area was obstructed by a landslide. A further 13,784 residents were displaced.

Damage

Despite the moderate size of the earthquake, its shallow depth caused strong shaking. The BNPB said the extent of damage to homes and buildings is still being assessed, but described the damage as "massive". At least 2,345 homes were damaged, including 343 homes which were heavily damaged. A shopping mall collapsed. Two government office buildings, three schools, a hospital, a religious facility and an Islamic boarding school were damaged.

Landslides cut off roads. A landslide along Puncak-Cipanas-Cianjur national road forced a traffic diversion. Toppled trees, uprooted power poles and downed power cables also occurred along roads. At least 434 homes experienced moderate to severe damage in Sukabumi Regency. No deaths were recorded but nine people had minor injuries. In Caringin Subdistrict, Lebak Regency, two schools and 89 houses were damaged, and a person was injured. Eighteen homes were damaged in Sukaraja Subdistrict, Bogor Regency.

Aftermath

The earthquake was felt strongly in Jakarta, Indonesia's capital, causing residents to flock to the streets. High-rise buildings swayed and were evacuated. President Joko Widodo directed Minister of Public Works and Public Housing (PUPR) Basuki Hadimuljono to survey the damage. On 21 November at 21:45, Minister Basuki arrived in Cianjur Regency.

The injured were taken to the four hospitals around Cianjur. Due to the large number of injured arriving at Cianjur Hospital, a field hospital was constructed in the parking space. The Governor of West Java, Ridwan Kamil, called for the Jabar Quick Response Team to respond. The team would arrive in the Cugenang, Warung Kondang, and Pacet Cipanas areas of Cianjur Regency. The Indonesian Medical Association mobilized 200 doctors, while the National Search and Rescue Agency mobilized personnel and equipment to five affected areas.

According to the BNPB, homes that were damaged will be reconstructed with earthquake resistance. PUPR mobilized personnel and heavy equipment to clear trees and landslide debris on roads. Electricity was cut from Cianjur District. Perusahaan Listrik Negara workers were deployed to restore power to 366,675 customers after the earthquake affected 1,957 substations.

The BMKG urged residents to be wary of potential flash floods and rain due to unstable slopes. The agency's head, Dwikorita Karnawati, said after the earthquake, materials on unstable slopes can be washed away, triggering floods and landslides. Residents were also adviced not to visit slopes and riverbanks due to the risk of flash floods.

See also


This page was last updated at 2022-11-21 19:32 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.

Contact

Top