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The 1960 Valdivia earthquake and tsunami (Spanish: Terremoto de Valdivia) or the Great Chilean earthquake (Gran terremoto de Chile) occurred on 22 May 1960.Most studies have placed it at 9.4–9.6 on the moment magnitude scale, [1] while some studies have placed the magnitude lower than 9.4, [6] [7] making it the most powerful earthquake ever recorded.
Chile lies in a region which is adjacent to the fast-moving Nazca plate, and has high tectonic activity.The records for earlier centuries are apparently incomplete. Of the world's 46 known earthquakes with M ≥ 8.5 since the year 1500, one-third occurred in Chile [citation needed] and are shown in the map to the side.
Probabilistic seismic hazard map. The earliest known earthquake in the U.S. state of California was documented in 1769 by the Spanish explorers and Catholic missionaries of the Portolá expedition as they traveled northward from San Diego along the Santa Ana River near the present site of Los Angeles. Ship captains and other explorers also ...
“Drop, Cover, Hold on. Protect yourself,” the U.S. Geological Survey warned moment before the eathquake struck.
The 1939 Chillán earthquake occurred in south-central Chile on 24 January with a surface-wave magnitude of 8.3 [1] and a maximum Mercalli intensity of X (Extreme).With a death toll of around 28,000, [4] compared to the 2,231–6,000 (official estimates vary greatly) [5] [6] of the Great Chilean earthquake of 1960, it is the single deadliest earthquake in Chile.
The Chino Fault and Whittier Fault are the two upper branches of the Elsinore Fault Zone, [2] which is part of the trilateral split of the San Andreas Fault system. The right-lateral strike-slip fault has a slip rate of 1.0 millimeter/year and is capable of producing anywhere from a M w 6.0 to a M w 7.0 earthquake.
Shake map provided by the US Geological Survey of the earthquake. / Credit: USGS The earthquake was first registered as having a preliminary magnitude of 6.6, but USGS updated it to 7.0.
Monday's magnitude 4.4 earthquake — centered near Highland Park — came with an early warning from California's quake alert system.