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Frontiers | An Evaluation of Strong-Motion Parameters at the S-net Ocean-Bottom Seismograph Sites Near the Kanto Basin for Earthquake Early Warning

National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan We analyzed strong-motion records at the ground and borehole in and around the Kanto Basin and the seafloor in the Japan Trench area from three nearby offshore earthquakes of similar magnitudes (Mw 5.8–5.9). The seafloor strong-motion records were obtained from S-net, which was established to enhance tsunami and earthquake early warnings after the 2011 great Tohoku-oki earthquake disaster. The borehole records were obtained from MeSO-net, a dense network of seismometers installed at a depth of 20 m in the Tokyo metropolitan area. The ground records were obtained from the K-NET and KiK-net networks, established after the 1995 great Hanshin-Awaji earthquake disaster. The MeSO-net and S-net stations record the shakings continuously, while the K-NET and KiK-net records are based on triggering thresholds. It is crucial to evaluate the properties of strong motions recorded by the S-net for earthquake

Phivolcs launches self-check app for earthquake safety of houses

Phivolcs launches self-check app for earthquake safety of houses ByRaheema Velasco 423 ); Philippine Institute of Volcanology and Seismology (Phivolcs – DOST) launched a mobile application that can assess the vulnerability of houses to strong earthquakes. “Earthquakes per se do not kill people, building collapses do,” DOST Undersecretary Renato Solidum Jr. said. Called “How Safe Is My House?,” this application provides a simple and easy-to-use tool for owners and occupants of residential houses and other one to two storey concrete hollow block houses. Users will have to answer 12 questions on the app and these are: Who built or designed my house? How old is my house?

Small magnitude 3 9 earthquake 51 miles southwest of Atka, Alaska, United States

Sun, 18 Jul 2021, 21:07 21:07 PM | BY: EARTHQUAKEMONITOR 3.9 quake 18 Jul 11:30 am (GMT -9) Just 36 minutes ago, a 3.9-magnitude earthquake struck near Atka, Aleutians West, Alaska, USA. The tremor was recorded in the morning on Sunday 18 July 2021 at 11:30 am local time, at a moderately shallow depth of 30 miles below the surface. The event was filed by the United States Geological Survey, the first seismological agency to report it. Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.9 as well. According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Atka (pop. 64, 51 miles away), the quake was probably not felt.

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