6/14/2023 0 Comments Sumatrapdf edit![]() ![]() It was the result of right-lateral strike-slip faulting associated with rupture along a segment of the Great Sumatran Fault. The mainshock occurred on 25 February with an epicenter on the slopes of Mount Talakmau. Earthquake Ī strong ground motion map of the mainshock It produced its largest earthquake in 1943 measuring M s 7.8. In 1933, a magnitude 7.5 earthquake struck Liwa, killing many people and causing widespread damage. ![]() It was the source of the 1994 Liwa and 1995 Kerinci earthquakes. The fault is divided into about 20 segments. The Great Sumatran fault is a 1,900 km (1,200 mi)-long strike-slip fault system located on Sumatra. Ĭonvergence along this plate boundary is highly oblique, severely deforming the overriding Sunda Plate, where it is accommodated by strike-slip motion along the Great Sumatran fault. ĭip-slip faults can rupture within the down going Australian Plate as well-the 2009 magnitude 7.6 earthquake near Padang was caused by reverse faulting at about 80 km (50 mi) depth. The subduction plate interface can rupture to the trench, triggering large tsunamis such as in 1907, 20. The subduction zone offshore Sumatra was responsible for several large earthquakes in 20. The west coast of Sumatra is dominated by the Sunda megathrust a 5,500 km (3,400 mi) long convergent boundary where the Australian Plate subducts beneath the Burma Plate and Sunda Plate at a rate of 60 mm (2.4 in) per year. ![]() Landslides and flash floods caused additional damage and casualties. The heaviest damage was recorded at three villages around Mount Talakmau. It inflicted 780 million Indonesian rupiahs (Rp) worth of damages. At least 27 people died, 457 were injured, and 19,221 others were displaced. The mainshock was the result of strike-slip faulting along a previously unidentified segment of the Great Sumatran Fault. Preceded by one foreshock and followed by over 200 aftershocks, the mainshock had an epicenter at the foot of Mount Talakmau in Pasaman Regency. On 25 February 2022 at 08:39 WIB, a moment magnitude (M w ) 6.2 earthquake struck West Sumatra, Indonesia at a depth of 4.0 km (2.5 mi). ![]()
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