Strong and shallow M6.1 earthquake hits Sulawesi, Indonesia

A strong and shallow earthquake registered by the USGS as M6.1 hit Sulawesi, Indonesia at 07:00 UTC on September 28, 2018. The agency is reporting a depth of 18.1 km (11.2 miles). EMSC is reporting M6.1 at a depth of 10 km (6.2 miles), BMKG M5.9 at the same depth.

According to the USGS, the epicenter was located 30 km (18 miles) N of Donggala, 57 km (35 miles) NNW of Palu (population 282 431), and 155 km (96 miles) NW of Poso (population 47 110 miles).

There are 1 110 000 people living within 100 km (62 miles) and about 4 000 within 10 km (6.2 miles).

The USGS registered M5.4 and 4.9 aftershocks at 07:00 and 07:28 UTC, respectively. Both at a depth of 10 km.

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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 vulnerable to earthquake shaking, though resistant structures exist. The predominant vulnerable building types are informal (metal, timber, GI etc.) and heavy wood frame construction.

Estimated population exposure to earthquake shaking

Selected cities exposed

Regional seismicity

Featured image credit: USGS, EMSC

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