A strong and deep earthquake M 7.4 struck south of Tonga on May 23, 2013 at 17:19 UTC. By preliminary reports USGS measured depth at 171 km, EMSC is reporting 179 km. Epicenter was located at the sea, 255km (158mi) SW of Vaini, Tonga and 753km (468mi) SE of Suva, Fiji at coordinates 23.100°S 176.600°W.
There are no people living in 100 km radius.
This earthquake was near the Tonga trench, a convergent plate boundary, in the region well known for seismic activity. The trench lies at the northern end of the Kermadec-Tonga Subduction Zone, an active subduction zone where the Pacific Plate is being subducted below the Tonga Plate and the Indo-Australian Plate.
This seismicity maps have been generated by concatenating the ISC catalogue (since 1964), the EMSC Euro-Med Bulletin catalogue and the EMSC Real Time catalogue. Therefore, they show the seismicity from 1964 until the earthquake occurrence. Credit: EMSC
Tectonic summary by USGS
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