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1966 Hualien earthquake

Field	Value
title	1966 Hualien earthquake
timestamp	1966-03-12 16:31:20
isc-event	849160
anss-url	iscgem849160
local-date
local-time	00:31
map2	{{Location map	China
relief	1	border = infobox
lat	24.24
long	122.67
mark	Bullseye1.png
marksize	40
position	top
width	250
float	right
caption	}}
magnitude	8.0
depth	22 km
location
type	Strike-slip
countries affected	Taiwan and Japan
tsunami	Yes
intensity
casualties	6 dead

| isc-event = 849160 | anss-url = iscgem849160 | local-date = | local-time = 00:31

The 1966 Hualien earthquake occurred on March 13 at 00:31 local time of Taiwan. The epicenter was located in the offshore area between Yonaguni Island, Japan and Hualien, Taiwan.

The intensity in Yonaguni reached shindo 5. Two people were reported dead in Yonaguni, Japan, and four in Taiwan. Building damage was reported. A tsunami with a run-up height of 50 cm was observed.

This earthquake released a seismic moment of 4.86×1020 Nm. The magnitude of this earthquake was put at 8.0, 7.79, 7.8, or 7.8. This earthquake had a strike-slip faulting focal mechanism.

The fault plane solutions of this earthquake suggested that there is a sliver of crust off the east coast of Taiwan other than the Philippine Sea plate. The map of shallow earthquakes shows that the Philippines are encircled by a zone of seismicity. There is a difference between the slip direction on the east coast of the Philippines and the relative motion between the Philippine Sea plate and the Eurasian plate. Together with other evidences, it has been suggested that most of the Philippines might belong to a minor plate other than the Eurasian plate.

References

"Significant Earthquake Information". NOAA National Centers for Environmental Information.
(1998). "Can Great Earthquakes Occur in the Southernmost Ryukyu Arc-Taiwan Region?". Terrestrial, Atmospheric and Oceanic Sciences.
"与那国島周辺の地震". Headquarters for Earthquake Research Promotion.
"地震と津波". Jma-net.go.jp.
(1997). "Simulation of historical tsunamis in the Taiwan region". Terrestrial, Atmospheric and Oceanic Sciences.
(2004). "Crustal structure of the southernmost Ryukyu subduction zone: OBS, MCS and gravity modelling". Geophysical Journal International.
"Archived copy".
(1977). "The instantaneous rotation vector of the Philippine sea plate relative to the Eurasian plate". Tectonophysics.

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