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One of the largest historical earthquake on the fault zone was the 1990 Luzon M s 7.8 event that left nearly 2,000 people dead or missing. The same part of the fault zone is thought to have ruptured in the 1645 Luzon earthquake. [7] Further south the fault ruptured during the 1973 Ragay Gulf earthquake.
The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]
An earthquake's seismic moment can be estimated in various ways, which are the bases of the M wb, M wr, M wc, M ww, M wp, M i, and M wpd scales, all subtypes of the generic M w scale. See Moment magnitude scale § Subtypes for details. Seismic moment is considered the most objective measure of an earthquake's "size" in regard of total energy. [50]
The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake – an event occurring at greater or lesser depth. (The "M w" scale is ...
1139 Ganja earthquake: September 30, 1139: Ganja, Seljuk Empire (modern-day Azerbaijan) 230,000–300,000 [10] 7.0 M w Death toll may have been a historical conflation with earthquakes on November 1137 in the Jazira plain and the 1138 Aleppo earthquake. [11] 2004 Indian Ocean earthquake and tsunami: December 26, 2004: Sumatra, Indonesia ...
The 2017 Surigao earthquake occurred on February 10, 2017, at 10:03 PM , with a surface-wave magnitude of 6.7 off the coast of Surigao del Norte in the Philippines. According to the PHIVOLCS earthquake intensity scale the earthquake was an Intensity VII ( Destructive ) earthquake at maximum.
A magnitude 6.1 earthquake struck the Philippines 23 km (14 mi) northwest of Santa Monica on the island of Siargao on July 3 at a depth of 32.0 km (19.9 mi). [117] One person died of a heart attack in Balingasag and minor damage was observed in Del Carmen, Surigao del Norte .
The 2017 Botswana earthquake was the strongest earthquake recorded in Botswana since 1952. [98] [99] Thirty-six students were injured in a stampede sparked by the quake. [100] 36 4 [101] Philippines, 5 km west of Batangas City: 5.1: 18.2: VI 2017 Batangas earthquakes: The earthquake damaged houses in Batangas City and the Taal Basilica.