1973 Ragay Gulf earthquake

Earthquake in the Philippines Strike-Slip 1973 Ragay Gulf earthquake 15 dead,National Geophysical Data Center Significant Earthquake Information https://www.ngdc.noaa.gov/hazel/view/hazards/earthquake/event-more-info/4632 National Geophysical Data Center 5 September 2021 10.7289/V5TD9V7K 1973 ~100 injured 5.4 w yes M 5.4 – 27 km NNE of Brgy. Bachaw Norte, Kalibo, Philippines https://earthquake.usgs.gov/earthquakes/eventpage/usp0000187/executive United States Geological Survey–ANSS 31 August 2021 VIII MMI 9 $2 million Quezon, and Camarines Sur, Philippines Philippine Fault 13.372 122.787 inline,title 33 km 7.4 w yes 16:30:51 PST March 17, 1973 usp00000z7 1973-03-17 08:30:51 Luzon mainland 762981 The 1973 Ragay Gulf earthquake occurred at around 16:30 local time (UTC +8). It measured 7.4 w y and had a maximum intensity of IX (Violent) on the Modified Mercalli intensity scale. The Philippine Institute of Volcanology and Seismology assigned a maximum intensity of VIII (Very Destructive) on the PHIVOLCS earthquake intensity scale.M 7.0 – 13 km ENE of San Andres, Philippines https://earthquake.usgs.gov/earthquakes/eventpage/usp00000z7/executive live 2021-08-30 United States Geological Survey https://web.archive.org/web/20210831100328/https://earthquake.usgs.gov/earthquakes/eventpage/usp00000z7/executive 2021-08-31 1973 March 17 Ms7.0 Ragay Gulf Earthquake https://www.phivolcs.dost.gov.ph/index.php/earthquake/destructive-earthquake-of-the-philippines/2-uncategorised/207-1973-march-17-ms7-0-ragay-gulf-earthquakeNCEI Global Historical Hazard Database https://www.ngdc.noaa.gov/hazel/view/hazards/earthquake/event-more-info/4632 2021-09-06 National Geophysical Data CenterISC-GEM Global Instrumental Earthquake Catalogue (1900–2009) http://www.isc.ac.uk/cgi-bin/web-db-run?event_id=762981&out_format=ISF2&request=COMPREHENSIVE 2022-09-12 International Seismological Centre It killed 14 people, injured 100 others and caused an estimated $2 million in damage.Today in Earthquake History https://earthquake.usgs.gov/learn/today/index.php?month=3&day=17 2021-08-31 United States Geological Survey Earthquake The epicenter was located around 17 km east northeast of San Andres in Ragay Gulf with a depth of 33 km (20.5 mi). It was due to the movement of one of the Philippines' largest fault; the Philippine fault system with the focal mechanism corresponding to strike-slip. Surface rupture and fissures The earthquake produced an onshore surface rupture 30 km along the Guinayangan segment of the Philippine Fault. It also caused left-lateral offset on a beach line for approximately 3.2 meters.Coseismic Displacement and Recurrence Interval of the 1973 Ragay Gulf Earthquake, Southern Luzon, Philippines https://www.researchgate.net/publication/276849437 2021-08-31 ResearchGateYasuda Hirotake Bacolcol Teresito Daag Arturo Bariso Ericson Mitiam Emmanuelle Marjes Jaime Nakata Takashi 2015 Geometry and Structure of the Philippine Fault in Ragay Gulf, Southern Luzon https://www.jstage.jst.go.jp/article/jdr/10/1/10_91/_article/-char/en Journal of Disaster Research 10 1 91–98 10.20965/jdr.2015.p0091 free There were also fissures, one of them being 15 centimeters in width. Two more fissures were found though with unknown lengths, along the foothills northwest of the Philippine National Railways (PNR) terminal in the municipality of Calauag. Near eastern bank of the Calauag River, multiple mudboils were spotted.Ragay Gulf earthquakes other geological features https://www.phivolcs.dost.gov.ph/index.php/17-earthquake/38-1973-march-17-ragay-gulf-earthquake live https://web.archive.org/web/20210831100337/https://www.phivolcs.dost.gov.ph/index.php/17-earthquake/38-1973-march-17-ragay-gulf-earthquake 2021-08-31 Damage Calauag According to PHIVOLCS, in Calauag, Quezon, the worst hit, 270 houses were partially damaged, and 98 completely destroyed; most of which were poorly built or entirely made of wooden materials. In Barrio Sumulong, also part of Calauag, 70% of school buildings were damaged.Sabillo Kristine Angeli 2013-10-15 Deadliest earthquakes that shook the Philippines https://newsinfo.inquirer.net/507653/deadliest-earthquakes-that-shook-the-philippines 2021-08-31 Philippine Daily Inquirer Lopez In the neighboring town of Lopez, concrete hollow blocks of the walls in a 5-room PTA building of the Lopez Provincial School collapsed. A three-storey concrete residential building tilted to the north. The facade of the Rosario Catholic Church of Lopez suffered cracks. In Barrio Hondagua, a theater which was converted into a restaurant collapsed completely and a chapel was partially destroyed. The concrete columns of the housings of the conveyor machines of the Philippine Flour Mills buckled down.NCEI Global Historical Hazard Database https://www.ngdc.noaa.gov/hazel/view/hazards/earthquake/event-more-info/4632 2021-08-31 National Geophysical Data Center Transportation The earthquake caused damage to all forms of transportation linking to and from Bicol Region. At least four highway bridges on the Manila South Road suffered severe damage. A PNR bridge crossing the Calauag River, and about 600 meters north of the highway bridge was badly damaged though it did not collapse. Another PNR bridge in Morato Tagkawayan was slightly moved. Its ties moved eight centimeters to the east, and the base plate of its westerns abutment moved five centimeters to the south. Agriculture The agricultural near the epicenter of the quake were mainly coconut plantations. The tremor's effects on the industry were not immediately felt, however after a few months, coconut production was on a down low due to young nuts that were shaken by the earthquake. See also List of earthquakes in the Philippines List of earthquakes in 1973 References Category:1973 earthquakes Category:1973 in the Philippines Category:1973 disasters in the Philippines Category:March 1973 in Asia Category:Earthquakes in the Philippines Category:History of the Bicol Region Category:History of Camarines Norte Category:History of Camarines Sur Category:History of Quezon