17 December 2020, Research Spotlight 19 March 2021. 12 February 2021, Science Update Fig. Eos is a source for news and perspectives about Earth and space science, including coverage of new research, analyses of science policy, and scientist-authored descriptions of their ongoing research and commentary on issues affecting the science community. Globally, this is the deepest (678 km) major (MW > 7) earthquake in the seismological record. The epicentre of the earthquake was 155km (95 miles) off the Bonin Islands, some 1,000km south-east of Tokyo, the USGS said. Japan earthquake today measuring 8.5 magnitude strikes near Ogasawara islands By Disaster Report May 30, 2015 An earthquake with a magnitude of 8.5 struck near the Ogasawara islands at 8:24 p.m. Saturday, Japan Meteorology Agency (JMA) reported. A 7.8 magnitude earthquake struck in the ocean off Japan's remote Bonin Islands at 11:23 GMT on Saturday, USGS reports. After contrasting three-dimensional numerical simulations of seismic wave propagation from both events, the researchers concluded that waves originating from a deep source outside of the slab can develop a distinctive, low-frequency wavefield as they interact with continental crust and the region’s subducting slabs. 2015 Ogasawara earthquake; S. Seismicity of the Sanriku coast; Last edited on 2 May 2020, at 03:48. The largest recorded deep-focus earthquake (MW 7.9) in the Izu-Bonin slab struck on 30 May 2015 … An earthquake with a magnitude of 8.5 struck near the Ogasawara islands at 8:24 p.m. Saturday. Content is available under CC BY-SA 3.0 unless otherwise noted. This page was last edited on 2 May 2020, at 03:48 (UTC). The ~680 km deep 30 May 2015, Ogasawara (Bonin) earthquake (M w 7.9) and its aftershocks were recorded by seismic stations at distances from 7° to 19°. A local, small velocity jump might also exist just below the earthquake. 2015 Ogasawara earthquake is an earthquake caused on May 30, 2015. Geology & Geophysics A strong earthquake centered on a southern chain of Japanese islands shook buildings in the Tokyo area but appeared to cause little damage. The magnitude-7.8 quake struck off the Ogasawara islands Saturday night at a depth of 678 kilometers (421 miles), the U.S. Geological Survey said. Research Spotlight. … 2015 Ogasawara earthquake is an earthquake caused on May 30, 2015. 1b, c). The isolated 2015 deep event. Unusual ground motion associated with the deepest major earthquake in the seismological record is due to both its great depth and its origin away from the subducting slab. The Japan Meteorological Agency said there was no danger of a tsunami. A magnitude-8.5 earthquake strikes west of the Ogasawara chain, rattling the Kanto region and causing moderate tremors in many parts of the archipelago. The 680-kilometer-deep earthquake was also notable for its unusual ground motion. Terri Cook Request PDF | The Curious Case of the Ultradeep 2015 Ogasawara Earthquake | Unusual ground motion associated with the deepest major earthquake in … The earthquake … The results indicated that the peculiar ground motion associated with the 2015 earthquake was due to its great source depth as well as its location outside of the subducting slab. 26 March 2021, News The magnitude 6.9 quake Saturday evening occurred in the Pacific Ocean west of the Ogasawara island chain, at a location about 1,000 kilometers A deep-focus earthquake is defined as an earthquake with a hypocenter depth greater than 300 … Keiko Kuge's Publications Refereed Papers. (2015 Ogasawara earthquake) A magnitude 6.0 earthquake struck offshore of Tonga 46 … The team found that the ultradeep event was missing high-frequency components and generated milder ground motions at regional distances, whereas the 2010 earthquake included the high-frequency components but was narrowly focused. The strong quake shook buildings in Tokyo for about a minute. [3] The Associated Press agency reported "twelve people suffered minor injuries", and TEPCO claimed that 400 customers lost electricity in Saitama Prefecture. The quake struck at a depth of 590 kilometers near the Ogasawaras which are 1,000 kilometers south of Tokyo. At 21:18 (JST) on June 23, 2015, an M 6.8 (Mw 6.5) deep-focus earthquake (focal sphere shown in Fig. 1 shows the dramatic isolation of this (Journal Geophysical Research: Solid Earth, https://doi.org/10.1002/2017JB014519, 2017), Research Spotlight Seismic Observations Indicating That the 2015 Ogasawara (Bonin) Earthquake Ruptured Beneath the 660 km Discontinuity Keiko Kuge1 1Department of Geophysics, Kyoto University, Kyoto, Japan Abstract The termination of deep earthquakes at a depth of ~700 km is a key feature for understanding the physical mechanism of deep earthquakes. This earthquake was one of the largest deep-focus earthquakes in the world. Synthetic seismograms indicate that the P waveforms depend on whether the earthquake is located above or below the 660 km discontinuity. Instead of producing a band of high-frequency (>1 hertz) seismic waves concentrated along northern Japan’s east coast, as is typical for deep subduction-related earthquakes in this region, this event generated strong, low-frequency waves that jolted a broad area up to 2,000 kilometers from the epicenter. The largest recorded deep-focus earthquake (M W 7.9) in the Izu–Bonin slab struck on 30 May 2015 beneath the Ogasawara (Bonin) Islands, isolated from prior seismicity by over 100 km in depth, and followed by only a few small aftershocks. [9][10][11], "M 7.8 - 189km WNW of Chichi-shima, Japan", "12 hurt in Japan quake as life returns to normal", https://en.wikipedia.org/w/index.php?title=2015_Ogasawara_earthquake&oldid=1016111535, Articles to be expanded from December 2020, Articles needing translation from Japanese Wikipedia, Creative Commons Attribution-ShareAlike License. Journal of Geophysical Research: Solid Earth, By It struck at a … The earthquake shook buildings in Tokyo and temporary closed both runways at Narita Airport. On 30 May 2015, a powerful earthquake struck west of Japan’s remote Ogasawara (Bonin) island chain, which lies more than 800 kilometers south of Tokyo. The Japan Meteorological Agency said there was no danger of a tsunami. Kuge, K., Seismic observations indicating that the 2015 Ogasawara (Bonin) earthquake ruptured beneath the 660 km discontinuity, Geophys. [4] There were no deaths, but elevators stopped one after another, in Tokyo and elsewhere. 1a) occurred beneath the Ogasawara (Bonin) Islands, where high seismicity of deep-focus earthquakes is caused by the subduction of the Pacific slab along the Izu–Bonin arc (Fig. [5][6][7] The shaking of the earthquake was observed almost all over Japan. (CNN)A strong earthquake shook the Ogasawara Islands south of mainland Japan Saturday. 2. 19 January 2021, News The structure surrounding the 2015 Ogasawara (Bonin) deep earthquake was explored by observed regional P and S waves. Do not translate text that appears unreliable or low-quality. © 2021 American Geophysical Union. Introduction. The US Geological Survey said the 7.8-magnitude earthquake was centred 874km (543 miles) from the Japanese capital, at a depth of more than 660km. the mechanisms of earthquakes.” Between 2010 and 2015, Ogasawara’s research team was able to successfully instrumentally monitor earthquake activity in detail at gold mines at 1–3.4 km depths under the auspices of Japan Science and Technology Agency (JST) … [8] It is believed that this was due to a deep-focus earthquake. The largest recorded deep-focus earthquake (MW 7.9) in the Izu-Bonin slab struck on 30 May 2015 beneath the Ogasawara (Bonin) Islands, isolated from prior seismicity by over 100 km in depth, and followed by only 2 small aftershocks. @article{osti_1459820, title = {Source complexity of the 2015 Mw 7.9 Bonin earthquake}, author = {Chen, Yu and Meng, Lingsen and Zhang, Ailin and Wen, Lianxing}, abstractNote = {The 30 May 2015 Mw 7.9 Bonin earthquake, one of the largest and deepest earthquakes ever recorded by modern seismology, provides a unique opportunity to study the source process and physical mechanisms of … There have been no immediate reports of casualties or damage, nor any tsunami alert. The 30 May 2015 Ogasawara (Bonin) earthquake (11:23:02 UTC) has a 664 km deep hypocenter at 27.839 N, 140.493 E [USGS, National Earthquake Information Center (USGS-NEIC), http:// earthquake.usgs.gov/earthquakes/eventpage/us20002ki3#scientific_ origin:us_us20002ki3]. 28 December 2017. Seismic waves radiated during rupture provide our primary information about deep earthquake processes,... 2. 30 March 2021, Feature This page was last edited on 5 April 2021, at 13:03. • The 660 km discontinuity can be located above the earthquake. If possible, verify the text with references provided in the foreign-language article. 25 March 2021, News The epicenter was located 540 miles south of Tokyo in the Ogasawara Islands, according to the U.S. Geological Survey, which initially reported the quake as a … The quake struck at a depth of 590 kilometers near the Ogasawaras which are 1,000 kilometers south of Tokyo. A large but thankfully deep earthquake struck Japan on May 30, 2015, leaving no major casualties. The largest very deep earthquakes such as the 2013 Sea of Okhotsk event (610 km, Mw 8.2) and the 2015 Ogasawara event (680 km, Mw7.9) produce significant effects across the whole span of the Japanese islands, though the hypocenters were located more than a thousand kilometres from the main Japanese islands. The strong quake shook buildings in Tokyo for about a minute. 27 January 2021, News 30 October 2020, News The isolated 2015 deep event. Subduction May Recycle Less Water Than Thought, Using Earthquake Forensics to Study Subduction from Space, Students Monitor Campus Noise in Seismic Silence, Arctic Lightning Up 300% in One 11-Year Study, Ancient, Acidic Lakes May Have Harbored Life, Global Changes in 20‐Year, 50‐Year, and 100‐Year River Floods, Soil organic carbon pools in the northern circumpolar permafrost region, Heat Stress Indicators in CMIP6: Estimating Future Trends and Exceedances of Impact‐Relevant Thresholds, The Surprising Source of Greenhouse Gas Emissions, An Asteroid “Double Disaster” Struck Germany in the Miocene, Racist Slurs in Place-Names Have to Go, Say Geoscientists, A Vital Resource Supporting Antarctic Research, Tackling Challenges of a Drier, Hotter, More Fire-Prone Future. The United States Geological Survey said the quake measured 6.6 in magnitude. Although it caused little damage, the magnitude 7.9 quake was noteworthy for being the deepest major earthquake ever recorded—it occurred more than 100 kilometers below any previously observed seismicity along the subducting Pacific Plate—and the first earthquake felt in every Japanese prefecture since observations began in 1884. TOKYO — A strong earthquake shook a Japanese island chain in the Pacific Ocean south of Tokyo on Saturday, but there was no danger of a tsunami and there were no reports of damage or injuries. The isolated ∼680 km deep 30 May 2015 MW 7.9 Ogasawara (Bonin) Islands earthquake 1. The earthquake struck near the Ogasawara islands at a depth of 590 kilometers (370 miles), Japan's Meteorological Agency said. All rights reserved. A magnitude 7.8 earthquake struck offshore of Japan 189 km (117 mi) west northwest of Chichi-jima in the Ogasawara Islands on May 30 at a depth of 664.0 km (412.6 mi). Japan Earthquake: Large But Very Deep Temblor Strikes Offshore The magnitude-7.8 quake struck off the Ogasawaras islands at a depth of 421 miles, but was not strong enough to trigger tsunami warnings. An earthquake with a magnitude of 8.5 struck near the Ogasawara islands at 8:24 p.m. Saturday. Because this wavefield is usually concealed by higher-frequency, slab-guided waves, the few existing examples of this phenomenon will likely provide valuable information on local crustal structure and, in the case of the 2015 Ogasawara event, the morphology of the Pacific Plate. Source: 1 March 2021, News Although some initial reports logged the … A magnitude 7.8 earthquake struck offshore of Japan 189 km (117 mi) west northwest of Chichi-jima in the Ogasawara Islands on May 30 at a depth of 664.0 km (412.6 mi). 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