The 1986 Hualien earthquake occurred on November 15, 1986, when a strong earthquake with a recorded magnitude of 7.4 struck Hualien City in Taiwan. The earthquake killed 15 people and injured 44. Landslides occurred along a highway between Su'ao and Hualien. The Taiwan–Guam and Taiwan–Okinawa undersea telecommunication cables were damaged. The earthquake triggered a tsunami with a maximum height of . The tsunami sank 10 fishing boats in Hualien and Yilan and was linked to six injuries.
Aftershocks The earthquake was preceded by a 6.5 foreshock on May 20, 1986 which struck north of Hualien at depth. The foreshock produced aftershocks located on two parallel, steep, east-dipping thrust faults. Aftershocks were distributed northwest of the mainshock and had depths shallower than , suggesting the earthquake ruptured unilaterally, northwest, and upward. The November 15, 1986 earthquake produced aftershocks largely concentrated at depths or shallower in the upper crust. Aftershocks extended deep.
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