2022 Taitung earthquakes

Last updated
2022 Taitung earthquakes
Hua Lian Xian Xian Chang Xu Zhen Wei Shi Cha Bei Zhen Dao De Bian Li Chao Shang 05.jpg
An excavator clearing building wreckage
Taiwan relief location map.jpg
Bullseye1.png
UTC  time2022-09-17 13:41:17
 2022-09-18 06:44:14
ISC  event 624819634
  624819865
USGS-ANSS ComCat
  ComCat
Local dateSeptember 17, 2022 (2022-09-17)
 September 18, 2022 (2022-09-18)
Local time21:41:17 (UTC+8)
 14:44:15 (UTC+8)
Magnitude6.5 Mw
 6.9 Mw
Depth7.3 km (4.5 mi) (foreshock) [1]
7 km (4.3 mi) (mainshock) [2]
Epicenter 23°09′18″N121°21′40″E / 23.155°N 121.361°E / 23.155; 121.361
Type Oblique–slip
Areas affected Changhua, Chiayi, Hualien, Nantou, Pingtung, Taitung and Yunlin Counties
Max. intensity
Peak acceleration0.51 g [3]
Tsunami0.41 m (1.3 ft)
AftershocksSome. Strongest is 5.6 Mw 
Casualties1 dead, 179 injured

Two earthquakes affected Taitung and Hualien Counties, Taiwan within hours of each other. The first earthquake struck Taitung on September 17, 2022, occurring with a magnitude of 6.5 Mw , causing minor damage and some injuries. The second earthquake occurred roughly a day after the first tremor struck the same area, with a stronger magnitude of 6.9 Mw . Both earthquakes had maximum Modified Mercalli intensities of VII (Very strong) and IX (Violent), respectively. [4] [5]

Contents

Tectonic setting

Taiwan lies on the boundary between the Eurasian Plate and the Philippine Plate, which converge at 80 mm per year. The island is the result of uplift caused by the collision between the northern end of the Luzon Arc and the continental margin of China. [6]

Earthquakes

USGS Shakemap M 6.9 - 86 km SE of Lugu, Taiwan.jpg
USGS Shakemap

The earthquakes were the result of shallow oblique-slip faulting. An analysis of both focal mechanisms suggest the earthquakes ruptured along a shallow WNW-dipping, SSW–NNE-striking sinistral fault or steep SSW–dipping, east-oriented oblique-dextral fault. [7] [8] Prior to the mainshock event, seismologists in Taiwan said it was produced along an unknown fault that was likely unstudied. [9] The epicenter location suggest a fault located along the west side of the Huadong Valley, responsible for thrusting the Central Mountain Range. The earthquake was attributed to continental collision between the Philippine Sea and Eurasian Plate. [10]

Foreshocks

The largest foreshock occurred on 17 September, measuring 6.4 ML  by the Central Weather Bureau (CWB). It struck at a depth of 7.3 km (4.5 mi) and had a maximum CWB seismic intensity of 6+. [11] After the mainshock, the 17 September earthquake and 70 subsequent shocks recorded later were reassigned as "foreshocks". [12] The Earthquake Prediction Center of the CWB said that 73 foreshocks were recorded, which is a rare occurrence. Five foreshocks had magnitudes larger than 5.0. [13]

It was felt strongly at Quanzhou, Xiamen in Fujian Province and Hangzhou in Zhejiang Province. [14] The Hong Kong Observatory received 10 reports of people feeling shaking; an analysis indicated it was felt with a maximum Modified Mercalli intensity of III. [15]

Mainshock

The United States Geological Survey reported that it had a moment magnitude of 6.9, [5] which was downgraded from an initial 7.2. [16] although the Japan Meteorological Agency reported that it had a magnitude (MJMA ) of 7.3. [17] The Central Weather Bureau reported that it measured 6.8 on the Richter magnitude scale. [18] It is considered the largest onshore earthquake in Taitung county since 1973. [19]

Tsunami warnings

The Japan Meteorological Agency issued a tsunami advisory with waves up to a meter high for Miyakojima and the Yaeyama Islands in Okinawa Prefecture. A tsunami threat was also issued by the Pacific Tsunami Warning Center. [20] A tsunami with heights of 0.41 m (1.3 ft) was observed. [21]

Aftershocks

Time

(UTC)

Magnitude (Mw ) MMI Source
2022-09-17 13:416.5VII [4]
2022-09-17 15:355.1VI [22]
2022-09-17 15:455.5VII [23]
2022-09-18 05:195.6VII [24]
2022-09-18 06:325.2II [25]
2022-09-18 06:446.9IX [5]
2022-09-18 06:575.1IV [26]
2022-09-18 08:465.2II [27]
2022-09-18 09:395.5VII [28]

Impact

September 17

A collapsed highway Hua Lian Xian Chang Xu Zhen Wei Xiang Zhong Yang Zheng Fu Zheng Qu Zhen Zai Shou Sun She Shi Zhong Jian Xing Zheng Yuan Chang Su Zhen Chang Biao Shi Hui Quan Li Zhi Chi Xiang Guan Zhao Pian 5.jpg
A collapsed highway

The Kaohsiung Metro system was temporarily suspended due to the shaking, and objects fell from shelves in Taitung City, where an old house collapsed. [29] [1] In Luye, part of the Baohua Bridge had been severely damaged. [30] A shopping mall in Kaohsiung City suffered cracks in floors and ceilings. [31] In Fuli, the wall of a house collapsed. [32] The Wan'an Brick Factory, a historical monument in Chishang, collapsed. [33] Eight people suffered minor injuries, [34] [35] and a man in Minxiong had to be treated for injuries after suffering a heart attack during the earthquake. [36]

September 18

Damaged house 918Qiang Zhen Xi Hua Lian Nan Qu Xian Chang Xu Zhen Wei Chi Xu Zou Fang Ge Chu Shi Cha Zai Sun 05.jpg
Damaged house

Along Zhongshan Road in Yuli, Hualien, a three-storey building housing a 7-Eleven store collapsed, injuring four people, who were all rescued. [37] [38] Part of the Dongli railway station was damaged and a train was derailed, and all 20 passengers were evacuated. [39] In Yuli, Hualien County, part of a highway collapsed, injuring three people. [40] Several other bridges were also damaged. [41] In Taoyuan, a sports center collapsed, injuring two people. [42] In Yuli, a cement factory collapsed, killing a 69-year old worker and injuring several others. [43] [44] In total, there were 171 reported injuries, most of them in Hualien and Taitung Counties. [45] [46]

In Yuli, 7,073 homes did not have power while blackouts were reported in Taipei, New Taipei, Tainan and Kaohsiung. According to the Ministry of Education, the earthquake damaged 594 schools, including 115 in Kaohsiung [47] 90 in Taipei. [48] The total incurred loss is at an estimated NT$4.61 million (US$147,310). [49]

Response

In a speech made shortly after the second earthquake, President Tsai Ing-wen warned of large aftershocks and called for citizens to remain vigilant. [50] The Central Emergency Operation Center was placed on its highest alert level in response to aftershocks. [51] The Atomic Energy Council said that nuclear plants across the country were unaffected and in usual operation. [12] About 400 tourists were rescued after being stranded on Chike Mountain due to landslides. [51] The local government ordered the closure of schools in Yuli, Fuli and Zhuoxi townships. School and work were suspended in Guanshan, Luye, Chihshang, Haiduan and Yanping townships. Schools and workplaces had to be close after noon of 18 September in the villages of Wulu, Lidao, Xinwu, and Haiduan. In Changbin township, work could resume but schools were suspended. [49]

See also

Notes

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    46. ↑ "The Taitung 6.8 earthquake caused a large number of disasters in Huadong. So far, 1 death and 83 injuries have been caused in Taiwan". Oriental Daily News (in Chinese). 18 September 2022.
    47. ↑ "532 Taiwan schools report damage from magnitude 6.8 earthquake". Taiwan News. 20 September 2022. Retrieved 2023-04-22.
    48. ↑ "918強震》教育部最新統計 594校災損估1億2728萬". 20 September 2022. Archived from the original on 2022-09-22. Retrieved 2022-09-20.
    49. 1 2 Lo, James (18 September 2022). "Series of earthquakes in Taiwan leave 1 dead, 79 injured". Focus Taiwan. Retrieved 18 September 2022.
    50. ↑ Yuanhong, Zhang (18 September 2022). "台東規模6.8強震！蔡英文：中央災防中心已一級開設". CTS News and Info (in Chinese). Archived from the original on 18 September 2022. Retrieved 18 September 2022.
    51. 1 2 Hsien-feng, Li; Lo, James (18 September 2022). "Tsai calls on public to stay vigilant of aftershocks in wake of quake". Focus Taiwan . Archived from the original on 18 September 2022. Retrieved 18 September 2022.

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