1933 Sumatra earthquake

The 1933 Sumatra earthquake or Liwa earthquake affected southern Sumatra, Indonesia, on 25 June at 04:54 WIB. The earthquake had an estimated surface-wave magnitude (M_s ) of 7.5–7.7 and occurred at a shallow depth of 20 km (12 mi). It was caused by slip along a 130 km (81 mi) section of the seismically active Great Sumatran fault, a major fault on the island that partially accommodates oblique convergence between the Australian and Sunda plates. The Kumering segment, one of 20 segments that make up the fault zone, near the southern end of the fault, may have produced the ruputure. The earthquake caused damage and hundreds of deaths in Kaur and Liwa. At least 788 people were reported killed, although the death toll may have been in the thousands. Aftershocks followed, including one that caused additional deaths. The mainshock also triggered a nearby volcanic eruption at Suwoh two weeks later, killing an unknown number of people.