Strong and shallow M6.9 earthquake hits Alaska Peninsula, U.S.


A strong and shallow earthquake registered by the USGS as M6.5 hit the Alaska Peninsula, U.S. at 09:10 UTC on October 11, 2021. The agency is reporting a depth of 69.1 km (42.9 miles). EMSC is reporting M6.8 at a depth of 51 km (31 miles).

The epicenter was located 118.5 km (73.5 miles) E of Chignik (population 87) and 670.8 km (415.9 miles) SSW of Anchorage (population 298 695), Alaska.

10 000 people are estimated to have felt light shaking.

Based on earthquake information and historic tsunami records, this earthquake is not expected to generate a tsunami, NWS NTWC said.

There is no tsunami danger for the U.S. West Coast, British Columbia, or Alaska.

The USGS issued a Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.

Overall, the population in this region resides in structures that are resistant to earthquake shaking, though vulnerable structures exist. The predominant vulnerable building types are unreinforced brick masonry and reinforced masonry construction.

Image credit: TW/SAM, Google

Regional seismicity

Featured image credit: TW/SAM, Google


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