1986 Hualien earthquake

On November 14, 1986, 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 0.3 m. The tsunami sank 10 fishing boats in Hualien and Yilan and was attributed to six injuries.

Aftershocks
The earthquake was preceded by a 6.5 foreshock on 20 May 1986 which struck north of Hualien at 15.8 km 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 16 km, suggesting the earthquake ruptured unilaterally, northwest, and upward. The 14 November 1986 earthquake produced aftershocks largely concentrated at depths 15 km or shallower in the upper crust. Aftershocks extended 37 km deep.