A strong and shallow earthquake registered by the CSN Chile as M6.6 hit the Biobio Region of Chile at 13:14 UTC on September 21, 2021, at a depth of 10 km (6.2 miles). The USGS is reporting M6.4 at a depth of 17.4 km (10.8 miles), EMSC M6.4 at a depth of 2 km (1.2 miles).
The epicenter was located about 75 km (46 miles) NW of Talcahuano (population 252 968) and 81 km (50 miles) W of Concepcion (population 215 413).
There are about 1.1 million people living within 100 km (62 miles).
6 000 people are estimated to have felt moderate shaking and 2 239 000 light, according to the USGS PAGER.
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 adobe block and rubble/field stone masonry construction.
Image credit: TW/SAM, Google
Estimated population exposure to earthquake shaking
Selected cities exposed
Featured image credit: TW/SAM, Google
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