2022 West Java earthquake

Coordinates: 6°51′11″S 107°05′42″E / 6.853°S 107.095°E / -6.853; 107.095
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2022 West Java earthquake
Collapsed building in Cianjur Regency
2022 West Java earthquake is located in Java
2022 West Java earthquake
UTC time2022-11-21 06:21:10
ISC event625234413
USGS-ANSSComCat
Local date21 November 2022 (2022-11-21)
Local time13:21 WIB (UTC+07:00)
Magnitude5.6 Mww
Depth11 km (7 mi)
Epicenter6°51′11″S 107°05′42″E / 6.853°S 107.095°E / -6.853; 107.095
TypeStrike-slip
Areas affectedIndonesia
Max. intensityMMI VI (Strong)
LandslidesYes
Casualties271 dead, 2,043 injured, 40 missing

On 21 November 2022, at 13:21 local time, a Mww 5.6 earthquake struck near Cianjur in West Java, Indonesia. At least 271 people died, 2,043 were injured and 40 remain missing. More than 56,230 homes were damaged in Cianjur.[1] The earthquake was strongly felt in Jakarta.

Tectonic setting

Java lies near an active convergent boundary that separates the Sunda Plate to the north and the Australian Plate to 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.[2]

Compared to the highly oblique convergence across the plate boundary in Sumatra, near Java, it is close to orthogonal. However, there is still a small component of left-lateral strike-slip that is accommodated within the over-riding Sunda Plate. The Cimandiri Fault is one of the structures thought to be responsible.[3] Field investigations, combined with morphometric analysis show that the Cimandiri Fault zone is a relatively broad zone of faulting and folding, with six segments identified. Older parts of the fault zone show evidence of dominant left-lateral strike-slip, while younger parts show mainly oblique slip, with a mixture of reverse faulting and left-lateral strike-slip.[4]

Earthquake

According to the Meteorology, Climatology, and Geophysical Agency (BMKG), the earthquake occurred at a depth of 11 km (7 mi), classifying it as a shallow event.[5] It had a strike-slip focal mechanism,[5] and is associated with seismic activity on the Cimandiri Fault or Padalarang Fault, although the exact source is undetermined.[6] The Cimandiri Fault is 100 km (62 mi) long and runs along the Mandiri River. 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.[7]

The earthquake may also have been produced along another fault. An engineering geology professor at Padjadjaran University said the epicenter location, 10 km (6.2 mi) from the Cimandiri Fault trace, makes it unlikely to be the source. The possible source fault was one that had been buried under volcanic deposits from Mount Gede.[8]

A Modified Mercalli intensity of V–VI was felt in Cianjur while an intensity of IV–V was felt at Garut and Sukabumi. In Cimahi, Lembang, Bandung City, Cikalong Wetan, Rangkasbitung, Bogor and Bayah, the earthquake was felt at an intensity of III.[5] Intensity II–III was felt in the Rancaekek, South Tangerang, Jakarta and Depok areas.[9] By 23 November at 07:00, 169 aftershocks were recorded with magnitudes between 1.5 and 4.0.[10]

The United States Geological Survey (USGS) stated that the earthquake occurred 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.[11]

Earthquakes have been recorded in Cianjur since 1844. In 1910, 1912, 1958, 1982 and 2000, earthquakes caused damage and casualties in the area.[12] Cianjur was also affected by an 1879 earthquake that claimed lives. Shallow inland earthquakes in Java are infrequent but deadly. In 1924, near Wonosobo, about 800 people died from two earthquakes. Four other earthquakes in the 20th century caused between 10 and 100 deaths. The 2006 Yogyakarta earthquake was also a shallow crustal earthquake, killing 5,749 people.[13]

Impact

A simulated strong ground motion map showing shaking intensity

Despite the moderate size of the earthquake, its shallow depth caused strong shaking.[14] Earthquakes of such size are usually associated with light damage but the shallow depth and poor construction factored in the destruction.[15] The National Agency for Disaster Countermeasure (BNPB) stated that the extent of damage to homes and buildings is still being assessed,[16] but described the damage as "massive".[17] Damage occurred in 12 of the 32 districts of Cianjur Regency—Cugenang District was the worst affected.[18]

At least 56,230 homes were damaged,[1] including 22,241 homes which were heavily damaged.[19][20] At least 11,641 and 22,090 homes had moderate and light damage, respectively. Thirty one schools, 124 religious buildings, 13 offices and three health facilities were also damaged.[19] A shopping mall collapsed.[21] Two government office buildings, three schools, a hospital, a religious facility and an Islamic boarding school were damaged.[21][22] The Ministry of Religious Affairs stated 21 mosques were damaged.[23]

A building in Cianjur Regency with facade damage

Landslides cut off roads.[24] 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.[25] The Ministry of Energy and Mineral Resources said two landslides occurred in Cugenang District. One measured 44 m (144 ft) and 16 m (52 ft) high while the latter measured 162 m (531 ft) and 45 m (148 ft) high.[26]

Power outages affected more than 366,000 homes, of which 89 percent were already restored.[27][28] At least 681 homes, six schools and 10 religious buildings were damaged in Sukabumi Regency. No deaths were recorded there although 11 people were injured and 58 families were displaced.[29] In Caringin Subdistrict, Lebak Regency, two schools and 89 houses were damaged, and a person was injured.[30] Seventy eight homes, a madrasah, and an Islamic boarding school were damaged in Bogor Regency.[31]

The earthquake was felt strongly in Jakarta, Indonesia's capital, causing residents to flock to the streets. High-rise buildings swayed and were evacuated.[32]

Casualties

At least 271 people died according to the BNPB,[33] all had been successfully identified.[34] Most of the deaths were caused by collapsing buildings. A majority were students of several schools who died after being hit by falling debris.[35] The BNPB revealed that 37 percent of those killed were children.[36] In Cikancana, a village in Gekbrong District, six students died from head injuries.[37] The bodies of 10 people were found beneath a landslide in Cugenang District.[18][38] On 22 November, the official death toll was reported at 62.[39] Later, it was misreported as 162 by West Java Governor Ridwan Kamil after combining unverified oral reports of 100 deaths with the previous official figure.[40] Casualty numbers were likely to rise as victims were still buried under building debris, and one area was obstructed by a landslide.[41][42]

A further 2,043 people were injured and up to 40 people remain missing,[33][43] possibly buried under collapsed structures.[44][45] Thirty nine people were missing in Cugenang and one in Warung Kondang.[33] Dozens of students were injured by falling debris at their schools.[46] The injured were taken to the four hospitals around Cianjur.[47] Due to a large number of injured arriving at Cianjur Hospital, a field hospital was constructed in the parking lot.[48] At Cimacan Hospital, 237 people received treatment—150 were released while 13 others died.[49] A further 61,000 people were displaced.[33][50]

Search and rescue

Search and rescue teams searching for survivors in a collapsed structure

About 6,000 rescuers were deployed.[51] The Indonesian Medical Association mobilized 200 doctors,[52] while the National Search and Rescue Agency mobilized personnel and equipment to five affected areas.[53] Search and rescue teams were deployed to locate the missing. Helicopters conducted aerial surveys and evacuated people.[54] As many as 796 personnel were distributed across 12 districts to search for missing individuals.[55] 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.[56] Heavy rain and the risk of landslides have slowed down search and rescue work. Aftershocks also raised the potential for landslides to be triggered. On 23 November, rescuers attended to Cugenang, where a village was buried by a landslide.[51]

Aftermath

Survivors in Cianjur constructed makeshift tents in public spaces or their yards. On 22 November, a survivor stated that they were still self-dependent because no assistance has been given.[57] For fear of aftershocks, residents did not return to their homes. In Pamoyanan village, Cianjur District, 150 residents spent the night under a pavilion. Others slept along roadsides or under the overhangs of shops. Food was still unavailable on the morning of 22 November.[58]

On 22 November, the Ministry of Social Affairs established 1,000 large tents in the seven affected districts. Ready-to-eat food items and a public kitchen were also supplied.[59] Thirty five personnel including five health professionals from Husein Sastranegara Air Force Base visited the affected area. The base also supplied food, medicine, kitchen appliances and logistics.[60] More than 1,000 soldiers from nearby units were dispatched to the area.[61]

According to the BNPB, homes that were damaged will be reconstructed with earthquake resistance.[62] Ministry of Public Works and Housing mobilized personnel and heavy equipment to clear trees and landslide debris on roads.[63] Electricity was cut from Cianjur District.[64] Perusahaan Listrik Negara (PLN) workers were deployed to restore power to 366,675 customers after the earthquake affected 1,957 substations.[65] By the morning of 22 November, 1,802 substations were functioning and electricity was restored in 89 percent of the area.[66]

Response

President Joko Widodo visits a landslide triggered by the earthquake

President Joko Widodo directed the minister of public works and housing, Basuki Hadimuljono, to survey the damage. Basuki arrived in Cianjur Regency on 21 November at 9:45 pm.[67] According to President Widodo, residents whose homes were heavily and moderately damaged would receive 50 million and 25 million rupiahs in assistance, respectively. Ten million rupiahs would be given to homes with light damage.[68] The BMKG urged residents to be wary of potential flash floods and rain due to unstable slopes. The agency's head, Dwikorita Karnawati, stated that materials on unstable slopes could be washed away, triggering floods and landslides. Residents were also advised not to visit slopes and riverbanks due to the risk of flash floods.[69]

See also

Earthquakes <M6.0 with a high death toll

References

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External links