2022 Taitung earthquakes

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"918 earthquake" redirects here. For the September 18 earthquake in India, see 2011 Sikkim earthquake.

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The 2022 Taitung earthquakes was a series of two earthquakes occurring at Taitung, Taiwan. The first earthquake struck Taitung on September 17, 2022, occurring with a magnitude of 6.5 ṃ, causing minimal damage and casualties. The second earthquake occurred roughly a day after the first tremor struck the same area, with a stronger magnitude of 6.9 ṃ. The earthquakes reached a maximum intensity of VII (Very Strong) and VIII (Severe) respectively on the Modified Mercalli Intensity Scale.[2][3]

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.[4]

Earthquake

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.[5][6] Prior to the mainshock event, seismologists in Taiwan said it was produced along an unknown fault that was likely unstudied.[7] 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.[8]

Aftershocks

After the mainshock, the 17 September earthquake and 70 subsequent shocks recorded later were reassigned as "foreshocks".[9]

Time

(UTC)

 Magnitude (ṃ) MMI Source
2022-09-17 13:41 6.5 VII [10]
2022-09-17 15:35 5.1 VI [11]
2022-09-17 15:45 5.5 VII [12]
2022-09-18 05:19 5.6 VII [13]
2022-09-18 06:32 5.2 II [14]
2022-09-18 06:44 6.9 VIII [15]
2022-09-18 06:57 5.1 IV [16]
2022-09-18 08:46 5.2 II [17]
2022-09-18 09:39 5.5 VII [18]

Impact

September 17

It was felt across the entire island, with buildings shaking as far away as the capital Taipei.[19] The Kaohsiung Metro system was temporarily suspended due to the shaking, and objects fell from shelves in Taitung City, where an old house collapsed.[20][1] In Fuli, the wall of a house collapsed.[21] Three people suffered minor injuries,[22] and a man in Minxiong had to be treated for injuries after suffering a heart attack during the earthquake.[23]

September 18

File:Building collapses in M6.9 earthquake.jpg
Destroyed building in Yuli, Hualien

Along Zhongshan Road in Yuli, Hualien, a three-storey building housing an convenience store collapsed, injuring four people, who were all rescued.[24][25] Part of the Dongli railway station was damaged and a train was derailed, and all 20 passengers were evacuated.[26] In Yuli, Hualien County, part of a highway collapsed, injuring two people.[27] In Taoyuan, a sports center collapsed, injuring two people.[28] In Yuli, a cement factory collapsed, killing a worker and injuring several others.[29] In total, there were 83 reported injuries, most of them in Hualien and Taitung Counties.[30]

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 72 schools, some partially collapsing. The total incurred loss is at an estimated NT$4.61 million (US$147,310).[31]

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.[32] The Central Emergency Operation Center was placed on its highest alert level in response to aftershocks.[33] The Atomic Energy Council said that nuclear plants across the country were unaffected and in usual operation.[9] About 400 tourists were rescued after being stranded on Chike Mountain due to landslides.[33] 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.[31]

Tsunami warnings

The Japan Meteorological Agency issued a tsunami advisory with waves up to a meter high in parts of Okinawa Prefecture. A tsunami threat was also issued by the Pacific Tsunami Warning Center.[34]

See also

References

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