Saturday 7 June 2014

Magnitude 4.1 Earthquake on western Molokai Island, Hawaii.

The United States Geological Survey recorded a Magnitude 4.1 Earthquake close to the surface on western Molokai Island, Hawaii, sllightly after 4.40 pm local time on Friday 6 June 2014 (slightly after 2.40 am on Saturday 7 June GMT). People have reported feeling the quake Molokai, Oahu, Lanai, Maui and Kahoolawe Islands, but thereare no reports of any damage or injuries.

The approximate location of the 6 June 2014 Molokai Earthquake. Google Maps.

The islands of Hawaii have formed as a result of hotspot volcanism, with the hotspot currently located under Big Island, Hawai'i, and each of the other islands being the result of previous activity from the same hotspot, with the oldest Islands in the northwest and newest in the southeast. A volcanic hotspot is an area where magma from deep inside the Earth is welling up through the overlying plate (in this case the Pacific) to create volcanism at the surface. Volcanoes move as they erupt, swelling as magma enters their chambers from bellow, then shrinking as that magma is vented as lava. The movements of a group of volcanoes close to one another can place considerable strain on layered rocks, and the islands of Hawai'i, and in particular Big Island, are very prone to Earthquakes, though these tend to be small and frequent rather than large, rare and destructive.

Witness accounts of quakes can help geologists to understand these events and the rock structures that cause them. If you felt this quake (or if you were in the area but did not, which is also useful information) you can report it to the USGS here.

See also...

The United States Geological Survey recorded a Magnitude 3.6...

The United States Geological Survey recorded a Magnitude 2.6...

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