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The Cotabato sequence was followed by an earthquake, with a magnitude of M w 6.8 (ANSS) or M s 6.9 (PHIVOLCS), on December 15 at 14:11 PST with an epicenter in the neighboring province of Davao del Sur. It had a hypocentral depth of between 22.4 km (ANSS) and 3.0 km (PHIVOLCS) and a maximum felt intensity of VII MMI or VII PEIS. [46]
The 2019 Eastern Samar Earthquake struck the islands of Visayas in the Philippines on April 23, 2019 at 1:37:51 p.m. . [3] It had a moment magnitude of 6.5 [ 3 ] ( M ww 6.4 by USGS ) [ 4 ] and a local magnitude of 6.2 [ 5 ] with a max intensity of VI based on the PHIVOLCS Earthquake Intensity Scale(PEIS) . [ 3 ]
United States Geological Survey shake map for the 2019 Luzon earthquake; a maximum Mercalli intensity scale value of 6.6 was observed in Gutad, Floridablanca, Pampanga. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) initially reported an earthquake of magnitude 5.7 striking at 17:11 PST with an epicenter two kilometers N 28° E of Castillejos, Zambales.
The PHIVOLCS earthquake intensity scale (PEIS; Filipino: Panukat ng Pagyanig ng Lindol) [1] is a seismic scale used and developed by the Philippine Institute of Volcanology and Seismology (PHIVOLCS) to measure the intensity of earthquakes. It was developed as upon a specific response to the 1990 Luzon earthquake.
The earthquake may be the result of movement on the Tangbulan Fault, according to PHIVOLCS. [ 7 ] [ 8 ] [ 9 ] There were a series of large aftershocks , including nine of M ≥ 5.0 in the first 48 hours after the mainshock, [ 10 ] with the largest being an mb 5.7 event about an hour afterwards, which had a maximum felt intensity of VII (MMI).
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) initially reported a magnitude 6.5 earthquake striking at 8:03 am Philippine Standard Time (PST) in Cataingan, Masbate. [9] The report was later revised to a magnitude 6.6 earthquake. The earthquake was also felt in several parts of Luzon and the Visayas. [6]
The earthquake lasted for a minute and was produced by the Makilala-Malungon Fault which PHIVOLCS stated that could possibly produce a Magnitude 7.2 earthquake, with a possible Intensity VIII. [citation needed] Eight minutes after the mainshock a M w 3.5 aftershock followed which felt III.
PHIVOLCS Observatory at Mount Hibok-Hibok.. The Philippine Institute of Volcanology and Seismology (PHIVOLCS, Tagalog:; Tagalog: Surian ng Pilipinas sa Bulkanolohiya at Sismolohiya [2]) is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes, and tsunamis, as well as other specialized information and services primarily for the ...