2024 Hualien earthquake

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2024 Taiwan earthquake
Damage after the earthquake
2024 Hualien earthquake is located in Taiwan
2024 Hualien earthquake
UTC time2024-04-02 23:58:11
USGS-ANSSComCat
Local date3 April 2024
Local time07:58:11
Magnitude7.4 Mw
Depth34.8 km (22 mi)
Epicenter23°49′08″N 121°33′43″E / 23.819°N 121.562°E / 23.819; 121.562
near Hualien City, Hualien County, Taiwan Province, Republic of China
TypeReverse
Areas affectedTaiwan
Max. intensityCWA 6+

MMI VIII (Severe)
LandslidesYes
AftershocksMw 6.4, Mww 5.7
Casualties9 dead, 931+ injuries

On 3 April 2024, at 07:58:11 NST (23:58 UTC), a Mw 7.4 earthquake struck 18 km (11 mi)[1] south-southwest of Hualien City, Hualien County, Taiwan Province[a], Republic of China. It was the largest earthquake in Taiwan since the 1999 Jiji earthquake, and there have been several aftershocks above Mw 5.0.

Tectonic setting

Taiwan has a history of many strong earthquakes.[2] The island is located within a complex zone of convergence between the Philippine Sea Plate and Eurasian Plate. At the location of the earthquake, these plates converge at a rate of 75 millimetres (3.0 in) per year. To the south of Taiwan, oceanic crust of the Eurasian Plate is subducting beneath the Philippine Sea Plate creating an island arc, the Luzon Arc. At Taiwan the oceanic crust has all been subducted and the arc is colliding with continental crust of the Eurasian Plate. To the north of Taiwan the Philippine Sea Plate is in contrast subducting beneath the Eurasian Plate, forming the Ryukyu Arc.[3]

Earthquake

USGS ShakeMap

The earthquake had a maximum CWB seismic intensity of 6+ in Hualien City and 5 in Taipei.[4] At least 44 aftershocks were recorded following the earthquake.[5] A Mw 6.4 aftershock struck at 00:11 UTC,[6] followed by a Mw 5.7 event at 00:35,[7] a Mw 5.5 at 00:43[8] and a Mw 5.7 at 00:46.[9] The mainshock was the strongest earthquake to hit Taiwan since the 1999 Jiji earthquake, which measured Mw 7.7.[10] In China, shaking was felt in Shanghai, Suzhou, Shenzhen, Guangzhou, Shantou, and several cities in Fujian province. It was also felt in Hong Kong[11][12][13] and on the island of Yonaguni, Japan, where it measured Shindo 4 on the Japan Meteorological Agency seismic intensity scale.[14]

The earthquake had a focal mechanism corresponding to reverse-faulting at a 34.8 km (21.6 mi) depth. According to the United States Geological Survey, the rupture occurred on a northeast–southwest-striking, moderately dipping, reverse fault within the Eurasian Plate. The estimated rupture dimensions for a similarly sized reverse-faulting earthquake is 60 km (37 mi) by 35 km (22 mi). Its finite fault model indicated rupture on an east-southeast dipping plane. Slip occurred within an elliptical rupture area 60 km (37 mi) by 60 km (37 mi) on the plane. The maximum displacement was estimated at 1.2471 m (4 ft 1.10 in).[15] The shock's magnitude was identical to a 1986 earthquake that killed 15 people in Hualien.[16]

Tsunami

A 0.5 m (1 ft 8 in) tsunami was observed in Chenggong, Taitung. The Central Weather Administration of Taiwan issued an alert advising residents to evacuate to higher ground.[17]

The Ministry of Natural Resources of the People's Republic of China issued a second-highest level orange tsunami alert, warning of potential localized waves that could cause significant damage in affected coastal areas.[18] The Japan Meteorological Agency issued a tsunami warning for Okinawa Prefecture and as waves of 3 m (9.8 ft) were expected,[19] which was later downgraded to a "tsunami advisory."[20] A 30 cm (12 in) wave was observed at Yonaguni about 15 minutes after the earthquake. Waves were also expected along the Miyako and Yaeyama islands,[21] with 20 cm (7.9 in)-waves reaching the islands of Miyako and Ishigaki.[22] The tsunami warning was the first to be issued in Okinawa Prefecture since the 2011 Tōhoku earthquake and tsunami,[23] while the tsunami was the first to strike the area since 1998.[17] Due to this, flights in Okinawa and Kagoshima Prefectures were suspended, including Naha Airport and Miyako Airport which were evacuated to the third floors.[24][25][26] China's Tsunami Warning Centre, which is under the Ministry of Natural Resources, issued its highest alert level at level 1, or red.[12]

In the Philippines, evacuations were ordered by the National Disaster Risk Reduction and Management Council in the provinces of Batanes, Cagayan, Isabela and Ilocos Norte following a warning by PHIVOLCS. An advisory was issued to 23 provinces for "high tsunami waves" measuring 3 m (9.8 ft), which was later reduced to 30 cm (12 in).[27][11][28][29] At 10:03 a.m. (PST), the Pacific Tsunami Warning Center said "the tsunami threat has now largely passed," prompting PHIVOLCS to cancel the tsunami warning.[30]

Impact

Nine fatalities were reported,[31][32] while at least 934 people were injured[33] and 127 others were trapped, according to the National Fire Agency, which also recorded at least 1,067 earthquake-related incidents.[34] Among the dead were three killed by rockfalls while hiking with four more people[35] in Hualien's Taroko National Park.[29] The status of the four other people are unknown. Another person died when rockfalls occurred at the Daquingshui Tunnel along the Suhua Highway and crushed his truck.[13][36] One person also died after their car was hit by a falling boulder, while another fatality was reported inside a mine.[37] Twelve park visitors, including two Canadian nationals were trapped along a trail,[17] while 40 others were injured. Injuries were also reported across Hualien, Yilan, Taipei, New Taipei, Keelung, Taichung and Taoyuan due to falls or toppled objects.[12][36] Sixty people were trapped inside the 400-meter Jinwen Tunnel along the Suhua Highway.[17]

At least 125 buildings were damaged by the earthquake.[12] Of the 26 reported building collapses, more than half of these occurred in Hualien. Collapses trapped at least 20 people in the immediate aftermath.[38] In Hualien City, two houses, the nine-story Uranus building and a restaurant collapsed, trapping many people inside.[39][40] Twenty-two people were later rescued from the Uranus building.[17] A high school building in the city also sustained heavy damage.[41] A warehouse building also collapsed in New Taipei, causing three minor injuries.[42] Fifty people were subsequently rescued from the building.[37] Tiles were dislodged and fell off older buildings and some newer structures in Taipei.[21] Subsidence in Xindian District caused seven houses to collapse, forcing 12 people to evacuate.[43] A viaduct of the New Taipei Circular Line was reported to be misaligned, and all service on the Taipei Metro was briefly suspended for safety checks.[44] A portion of the ceiling in Taoyuan International Airport collapsed.[12] The Legislative Yuan building also sustained damage to its walls and ceilings,[29] while debris fell from the archway of Chiang Kai-shek Memorial Hall.[14] In Taichung, rockfalls blocked a road, damaging three cars and injuring a driver.[45]

Power outages affected 300,000 homes in Taiwan according to Taipower,[46] of which, 14,833 were in Taichung; 5,306 were restored within approximately 25 minutes of the earthquake.[47] Electricity was restored in 70% of households within two hours of the earthquake,[46] leaving around 91,000 homes without power.[17] Outages of water, gas and internet were also reported.[48][49] There were reports of damaged walls, debris and toppled bricks across much of the island.[12] High-speed railway services across Taiwan were partially suspended and major expressways in the eastern part of the island were closed.[14] No anomalies were recorded in any of Taiwan's three nuclear plants.[50]

A massive landslide occurred near Xiulin.[51] The Suhua Highway was closed after at least nine rockfalls occurred on the road. Rockfalls occurred on another highway which hit at least 12 cars and injured nine people.[52] A landslide along Provincial Highway 9 between Su'ao and Hualien blocked traffic at Chongde railway station, while a rockfall also occurred in the Heren-Chongde section of the Eastern Trunk line in Hualien.[46] A section of the Central Cross-Island Highway between Dayuling and Taroko was also closed.[36] Two German nationals were reported to have been trapped in a tunnel in Hualien.[17] Guishan Island suffered damage, with a large portion of the island collapsing into the ocean.[53]

Taiwan's earthquake alert system did not send an advanced alert of the mainshock unlike in previous instances.[34]

Response

Outgoing Republic of China president Tsai Ing-wen expressed concern about the damage and ordered the Republic of China Armed Forces to support the local government in Hualien and others parts of the island in rescue missions. Vice-president and president-elect Lai Ching-te called on the public to be careful and stay calm and announced the formation of an emergency centre to deal with the disaster.[12]

Several semiconductor firms, including Powerchip, InnoLux, UMC, King Yuan Electronics Company [zh], Taimide Tech, and TSMC temporarily suspended operations and evacuated their facilities in Hsinchu. TSMC said it expected losses of about $60 million from the earthquake.[12][54][55] The Taiwan Stock Exchange continued regular operations on 3 April despite the earthquake.[29]

The Taiwan Affairs Office of the People's Republic of China (PRC) said it was highly concerned with the earthquake and was willing to provide disaster relief assistance.[56]

Japan deployed military aircraft to observe possible damage in Okinawa Prefecture following the tsunami alert.[29] The Japanese government later announced that no damage had occurred.[21] Prime Minister Fumio Kishida expressed condolences and sympathy with Taiwan and offered the government's support.[57] Guatemala and Paraguay also expressed solidarity with Taiwan and offered support.[58]

See also

Notes

  1. ^ Nominal province as its government functions were removed since 2018.

References

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