A shallow magnitude 4.3 earthquake was reported early afternoon near Pinotepa Nacional, Santiago Pinotepa Nacional, Oaxaca, Mexico.
According to Mexico's National Seismological Service (SSN), the quake hit on Wednesday 28 July 2021 at 3:23 pm local time at a shallow depth of 14 km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.3 earthquake as well.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In El Zanjon (pop. 120) located 1 km from the epicenter, Santa Rosa de Lima (pop. 2,200) 3 km away, and La Luz (pop. 2,400) 4 km away, the quake should have been felt as light shaking.
Weak shaking might have been felt in Rio Grande (pop. 12,900) located 19 km from the epicenter, San Miguel Panixtlahuaca (pop. 5,700) 31 km away, and Santiago (pop. 10,100) 33 km away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Pinotepa Nacional (pop. 29,600) located 56 km from the epicenter, and Puerto Escondido (pop. 25,900) 61 km away.
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