A Pair Of Great Earthquakes Occur In The Wharton Basin West Of Sumatra In Indonesia The Maximum Mercalli Intensity Of This Strike Slip Doublet Earthquake Is Vii Very Strong Ten Are Killed Twelve Are Injured And A Non Destructive Tsunami Is Observed On The Island Of Nias - April 11 in History

The 2012 Indian Ocean earthquakes were magnitude 8.6 and 8.2 M_w  undersea earthquakes that struck near the Indonesian province of Aceh on 11 April at 15:38 local time. Initially, authorities feared that the initial earthquake would cause a tsunami and warnings were issued across the Indian Ocean; however, these warnings were subsequently cancelled. These were unusually large intraplate earthquakes and the largest strike-slip earthquake ever recorded.

Wharton Basin is the marine area of the north east quarter of the Indian Ocean. It is named after William Wharton (1843–1905), Hydrographer of the Navy. Alternative names are Cocos Basin and West Australian Basin.

Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 482,286.55 km² (182,812 mi.²), including adjacent islands such as the Simeulue, Nias, Mentawai, Enggano, Riau Islands, Bangka Belitung and Krakatoa archipelago.

Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian and Pacific oceans. Comprising over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea, Indonesia is the world's largest archipelagic state and the 14th-largest country by area, at 1,904,569 square kilometres. With over 280 million people, Indonesia is the world's fourth-most-populous country and the most populous Muslim-majority country. Java, the world's most populous island, is home to more than half of the country's population.

The Modified Mercalli intensity scale measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake.

In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep.

In seismology, doublet earthquakes — and more generally, multiple earthquakes or twin earthquakes — were originally identified as multiple earthquakes with nearly identical waveforms originating from the same location. They are now characterized as distinct earthquake sequences having two main shocks with similar/slightly different magnitudes that occurred twice in a single moment, sometimes occurring within tens of seconds, but sometimes separated by years. The similarity of magnitude — often within 0.4 magnitude — distinguishes multiplet events from aftershocks, which start at about 1.2 magnitude less than the parent shock and decrease in magnitude and frequency according to known laws.

A tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and underwater explosions above or below water all have the potential to generate a tsunami. Unlike normal ocean waves, which are generated by wind, or tides, which are in turn generated by the gravitational pull of the Moon and the Sun, a tsunami is generated by the displacement of water from a large event.

Nias is an island located off the western coast of Sumatra, Indonesia. Nias is also the name of the archipelago of which the island is the centre, but also includes the Batu Islands to the southeast and the small Hinako Islands to the west.

A pair of great earthquakes occur in the Wharton Basin west of Sumatra in Indonesia. The maximum Mercalli intensity of this strike-slip doublet earthquake is VII (Very strong). Ten are killed, twelve are injured, and a non-destructive tsunami is observed on the island of Nias.

2012 Indian Ocean earthquakes

Wharton Basin

Sumatra

Indonesia

Time Machine

Games

Favorites

Categories

Trending

Profile

Modified Mercalli intensity scale

Fault (geology)

Doublet earthquake

Tsunami

Nias