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The Great Sumatran fault, also known as Semangko fault, is a large strike-slip fault running the entire length of the island of Sumatra. This Indonesian island is located in a highly seismic area of the world, including a subduction zone off the west coast of the island.
This quake, together with the Great Alaskan earthquake (1964) and the Great Chilean earthquake (1960), account for almost half of the total moment. [35] [36] Since 1900, the only earthquakes recorded with a greater magnitude were the 1960 Chile earthquake (magnitude 9.5) and the 1964 Alaska earthquake in Prince William Sound (magnitude 9.2
Plate tectonic setting of Sunda megathrust USGS map showing rupture area of the 1833 quake. The 1833 Sumatra earthquake occurred on November 25 at about 22:00 local time, with an estimated magnitude in the range of 8.8–9.2 M w . It caused a large tsunami that flooded the southwestern coast of the island. There are no reliable records of the ...
Map of the Great Sumatran Fault with labeled segments. The Great Sumatran fault 1900 km in length is a major strike-slip fault zone that cuts through the island of Sumatra. . It accommodates the right-lateral strike-slip component of the highly oblique collision zone between the Indo-Australian plate and the Sunda pla
Variation of seismicity with depth across the Sunda Trench subduction zone, low-angle part is the Sunda megathrust – 2007 Bengkulu earthquakes mainshock shown by star. The Sunda megathrust is a fault that extends approximately 5,500 km (3300 mi) from Myanmar (Burma) in the north, running along the southwestern side of Sumatra, to the south of Java and Bali before terminating near Australia. [1]
Many aftershocks with magnitude readings between 5.0 and 6.0 were recorded for several hours after the initial earthquake which hit the west coast of northern Sumatra. [ 34 ] [ 35 ] Since the initial magnitude 8.6 earthquake, there have been 111 aftershocks over magnitude 4.0 according to USGS, including a magnitude 6.2 on 15 April 2012.
Map of the Great Sumatran fault with labelled segments The March 2007 Sumatra earthquakes occurred near the northern end of Lake Singkarak in Sumatra , Indonesia , on March 6. The first shock in this earthquake doublet struck with a maximum Mercalli intensity of VIII ( Severe ) and the second shock that arrived two hours later had a maximum ...
Map of the Great Sumatran Fault with labelled segments. The 1943 Alahan Panjang earthquakes occurred on June 8 and June 9 UTC (June 9, 1943, local time) in Sumatra, then under Japanese occupation. This was an earthquake doublet (the shocks occurred at the same location on consecutive days). [5] The first mainshock occurred on June 8 at 20:42 UTC.