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Very strong M7.3 earthquake hits Venezuela at intermediate depth
A very strong earthquake registered by the USGS as M7.3 hit near the coast of Sucre, Venezuela at 21:31 UTC on August 21, 2018. The agency is reporting a depth of 123.2 km (76.5 km). EMSC is reporting M7.3 at a depth of 112 km (69.6 miles). According to the USGS, the epicenter was located  20.9 km (13.0 miles) NNW of Yaguaraparo, 38.4 km (23.9 miles) ENE of Carúpano (population 112 082), 69.4 km (43.1 miles) WNW of Güiria (population 40 000), 107.6 km (66.9 miles) ESE Porlamar (population 87 120) and 109.1 km (67.8 miles) ESE of La Asunción (population  35 084), Venezuela. There are 560 000 people living within 100 km (62 miles). Based on all available data, there is no tsunami threat, PTWC said. Some 52 000 people are estimated to have felt very strong shaking, 2 089 000 strong, 2 587 000 moderate and 3 928 000 light. Buildings were evacuated in the capital Caracas and people fled homes. Shaking was felt as far away as …

Pine Glacier sheds another block of ice, a glacial 'aftershock'

© NASA Earth Observatory image by Jesse Allen
Pine Glacier shows cracks in the ice shelf.
Antarctica's fastest melting glacier, the large ice stream Pine Island Glacier, has shed another block of ice into Antarctic waters. The glacier, responsible for about 25% of Antarctica's ice loss, spawned an iceberg after "a kilometre or two" of ice broke off from the shelf's front. While the loss was miniscule compared to previous giant ice losses, it presents further evidence of the ice shelf's fragility, according to NASA.

The break was about ten times smaller than an event in July 2015 which saw a 30-kilometer-long (20-mile) rift develop below the ice surface before breaking through and calving an iceberg spanning 583 square kilometers (225 square miles).

"I think this event is the calving equivalent of an 'aftershock' following the much bigger event," Ian Howat, a glaciologist at Ohio State University, said. "Apparently, there are weaknesses in the ice shelf—just inland of the rift that caused the 2015 calving—that are resulting in these smaller breaks."
© Iceberg B31/NASA
Iceberg B31, 3 times the size of Manhattan
In August 2013 an iceberg, six times the size of Manhattan, calved off of Pine Island Glacier. B-31 which measures 32 kilometres by 19 kilometres with a height of 500 metres is under NASA observation as it continues to drift to sea.

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