Slow slip transients on faults may be connected to the occurrence of megathrust earthquakes along plate subduction zones 1.Recent geodetic observations have … Megathrust earthquakes on this structure tend to occur in pairs, with a relatively short time gap between them. Moreover, offshore observations near hypocenters are still limited.
The Nankai megathrust earthquakes are great earthquakes that occur along the fault that forms the plate interface between the subducting Philippine Sea Plate and the overriding Amurian Plate (part of the Eurasian Plate), which dips beneath… The Nankai-Suruga megathrust, the subduction zone lying to the south of the Japanese islands of Honshu, Shikoku and Kyushu, generates major and great earthquakes (moment magnitudes exceeding 7 and 8, respectively) on centennial or shorter times-cales (Ando, 1975).
By applying centroid moment tensor method into long‐term onshore seismograms, we obtained spatiotemporal variation of SVLFE activity occurred from June 2003 to May 2018. Any queries (other than missing content) should be directed to the corresponding author for the article.Can't sign in? By applying a method incorporating the effects of 3‐D subsurface structures into long‐term onshore seismograms, we show the spatial variations of well‐constrained shallow very low frequency earthquakes (SVLFEs) along the Nankai Trough, including events that occurred prior to offshore observations.
We find that SVLFE activities are related to the spatial variations of the slip‐deficit rate and pore fluid around the Philippine Sea plate boundary. Tsunami, 2011 Tōhoku earthquake and tsunami, Chūbu region, Japan, Nankai megathrust earthquakesJapan, Tsunami, 2011 Tōhoku earthquake and tsunami, Tokyo, HonshūWakayama Prefecture, 2011 Tōhoku earthquake and tsunami, Empire of Japan, Nankai Trough, Nankai megathrust earthquakesUnited Kingdom, Japan, Beijing, United States, London2011 Tōhoku earthquake and tsunami, Thucydides, Thailand, Hawaii, UnescoTsunami, 2011 Tōhoku earthquake and tsunami, Nankai megathrust earthquakes, Earthquakes in Japan, Richter magnitude scaleTsunami, Kōchi Prefecture, Shanghai, 2011 Tōhoku earthquake and tsunami, 1854 Tōkai earthquakeTokyo, Kyoto, Kobe, Shanghai, Osaka Prefecture2011 Tōhoku earthquake and tsunami, Tsunami, Nankai megathrust earthquakes, Kōchi Prefecture, South Korea The Nankai Trough megathrust earthquakes inflicted catastrophic damage on Japanese society and more widely.
We find that SVLFE activities are related to the spatial variations of the slip‐deficit rate and pore fluid around the Philippine Sea plate boundary.
These large inland earthquakes occurred within 10 years before the 1605 M7.9 Keicho Nankai earthquake and the 1944 M j 7.9 Showa Tonankai earthquake, which are megathrust earthquakes along the Nankai trough.
Despite this importance, conventional methods using onshore seismograms and one‐dimensional Earth models cannot well constrain the location and magnitude of shallow slow earthquakes due to the effects of three‐dimensional (3‐D) offshore subsurface structures. SVLFEs are effectively activated by mechanical weakening due to rich pore fluid in areas surrounding strongly locked zones. Forgot your username?Enter your email address below and we will send you your usernameEnter your email address below.Now at Earthquake Research Institute, The University of Tokyo, Tokyo, Japan SVLFEs are effectively activated by mechanical weakening due to rich pore fluid in areas surrounding strongly locked zones. The Nankai megathrust is located offshore Shikoku and Kyushu, Japan and is characterized by various kinds of slow earthquakes whose relative motions across the plate boundary faults are slower than regular earthquakes. Megathrust: Areas affected: Miyagi Prefecture Japan: Tsunami: Yes: Casualties ≈1,000: The 869 Sanriku earthquake 貞観地震, Jōgan jishin) and its associated tsunami struck the area around Sendai in the northern part of Honshu on 9 July 869 AD (or the 26th day of the 5th month in the 11th year of Jōgan).
Our results imply that spatial variations of long‐term SVLFE activity provide information on tectonic environments, which could constrain the rupture behavior of shallow plate boundaries during future megathrust earthquakes.National Research Institute for Earth Science and Disaster Resilience, Tsukuba, JapanJapan Agency for Marine‐Earth Science and Technology, Yokohama, JapanIf the address matches an existing account you will receive an email with instructions to retrieve your usernameHydrology, Cryosphere and Earth SurfaceJournal of Geophysical ResearchGeochemistry, Mineralogy, VolcanologyPlease note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Engineering and Applied GeophysicsPlease check your email for instructions on resetting your password. The Nankai megathrust has five distinct segments (A-E) that can rupture independently, the segments have ruptured either singly or together repeatedly over the last 1300 years.
Therefore, we propose the possibility that the apparent frictional coefficient was less than ~ 0.1 to explain the occurrence of these historical earthquakes.
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