The 1992 Flores Indonesia Tsunami

one of the more deadly tsunamis in recent history hit the island of Flores, located in Indonesia several hundred miles from the coast of northern Australia near the popular resort island of Bali. The tsunami hit on December 12, 1992, and was triggered by a magnitude 7.9 earthquake, with the earthquake faulting event lasting for a long 70 seconds. The tsunami had run-up heights of 15 to 90 (4-27 m) feet along the northeastern part of Flores Island, where more than 2,080 people were killed and at least another 2,000 injured. Large amounts of sediment slumped underwater on the north side of the island during the earthquake, generating the unusually large and destructive tsunami.

Flores is an island located above the subduction zone where the Indian-Australian plate is being pushed beneath the Eurasian plate, along a convergent boundary. This subduction zone produces some of the largest earthquakes and tsunamis in the world, including the December 24, 2004, massive Indian ocean tsunami. The earthquake that generated the Flores tsunami had its epicenter near the coast, and produced subsidence of 1.5-3.5 feet (0.5-1.0 m). Unlike most other tsunami-generating earthquakes in this part of the world, this earthquake was located on the back-arc side of the island, away from the trench and forearc. The type of fault that forms on the back side of the arc is called a back-thrust, which is what slipped producing the Flores tsunami.

There was very little warning time for the residents of Flores Island, because the epicenter of the earthquake that generated the tsunami was only 30 miles (50 km) off the northern coast of the island. The first waves hit less than five minutes after the initial earthquake shock, with five or six individual waves being recorded by residents in different places. Many places recorded three large waves, the first one preceded by a rapid withdrawal of water from the coast, then the wave arrived as a wall of water. In most locations the second wave was the largest, with run-up heights typically between 6-16 feet (2-5 m). However, run-up heights in the village of

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  • Leona
    What plates where the indonesian earthquake flores 1992?
    3 years ago