On 14 November 2019 at 16:17 UTC a major earthquake occurred in the Molucca Sea. In 1964, a historically unprecedented magnitude 9.2 earthquake struck the Aleutian Islands of Alaska. Megathrusts are the extremely large thrust faults that form at convergent plate boundaries, where one tectonic plate is being forced down beneath another tectonic plate. The earthquake prompted scientists to figure out that the Aleutians lie along a unique form of fault, now known as a “megathrust” fault. The tremor had an estimated moment magnitude 7.1. Thus, assessing their potential maximum magnitude and respective return periods is vital for seismic-tsunami hazard assessment.

That 1700 megathrust earthquake caused a tsunami which struck the coast of Japan. The last megathrust earthquake hit on January 26th, 1700 (1700.071) which has been estimated to have been in the 8.7–9.2 level.

January 10, 2019 February 18, 2019 Laura Schifman 0 Comments Alaska, earthquakes, GEO577, megathrust. The megathrust earthquake involved an average slip of 20 meters (66 ft). Megathrust subduction faults have caused the largest earthquakes ever recorded in human history. The tremor had an estimated moment magnitude 7.1.

On 10 November a warning was issued because of a convergence of critical planetary and lunar geometry from 11 to 15 November. The depth of the hypocenter (where the earthquake starts) is being reported at 9 to 10 kilometers by the Centro Sismológico Nacional (CSN) and the U.S. Geological Survey (USGS). The odds of a really big one – a magnitude 9 event similar to the megathrust earthquake and tsunami near Japan in 2011 – was estimated by a B.C. Most quakes are under 2 feet. The largest recorded megathrust earthquake was the 1960 Valdivia earthquake, estimated magnitude 9.4-9.6, centered off the coast of Chile along the Peru-Chile trench, where the Nazca Plate is subducting under the South American Plate. That was a very big move. In addition, they are often associated with devastating tsunamis. An earthquake struck the central coast of Chile on Aug. 1, 2019, shaking the small surfing town of Pichilemu as well as the nearby capital, Santiago.

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