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A seismogram recorded in Massachusetts, United States. The magnitude 9.1 (M w) undersea megathrust earthquake occurred on 11 March 2011 at 14:46 JST (05:46 UTC) in the north-western Pacific Ocean at a relatively shallow depth of 32 km (20 mi), [9] [56] with its epicenter approximately 72 km (45 mi) east of the Oshika Peninsula of Tōhoku, Japan, lasting approximately six minutes.
The subduction process causes bending of the down going plate, creating a deep trench. Continuing movement on the subduction zone associated with the Japan Trench is one of the main causes of tsunamis and earthquakes in northern Japan, including the megathrust Tōhoku earthquake and resulting tsunami that occurred on 11 March 2011.
The subduction zone has the potential to generate 100-foot-tall tsunami waves and kill ... Scientists recorded a slow-slip event in 2011 before the magnitude-9 Tohoku earthquake and tsunami in ...
In 2011 a M w 9.0–9.1 undersea megathrust earthquake caused by the subduction of the Pacific plate below the Okhotsk microplate. The worst effected areas in Tohoku, Japan experienced around six minutes of shaking. The main slip occurred at the "North America or Okhotsk plate". [15]
This subduction zone was responsible for the 2004 Indian Ocean earthquake and tsunami. [15] In parts of the megathrust south of Java , referred to as the Java Trench , for the western part, M w 8.9 is possible, while in the eastern Java segment, M w 8.8 is possible, while if both were to rupture at the same time, the magnitude would be M w 9.1.
The Japan Trench Fast Drilling Project (JFAST) was a rapid-response scientific expedition that drilled oceanfloor boreholes through the fault-zone of the 2011 Tohoku earthquake. JFAST gathered important data about the rupture mechanism and physical properties of the fault that caused the huge earthquake and tsunami which devastated much of ...
In 1983, it was proposed that subduction along the eastern margin commenced about 1–2 million years ago. [ 6 ] The basis for defining this tectonic boundary is the occurrence of large magnitude 7 or greater earthquakes along a linear zone from offshore Niigata Prefecture to off the west coast of Hokkaido. [ 7 ]
This earthquake resulted in at least 1 death and left at least 185 injured. [14] Serious damage was caused. There was no tsunami. It is believed that this was an aftershock of the earthquake almost 10 years to the exact date of the 2011 mainshock. [15] 2021-03-20 18:09:45 M w 7.0 M JMA 6.9