Note: The map shows areas with earthquakes of magnitude 4 or greater, which the USGS defines as “mild,” though quakes may have been felt outside the areas shown. the new York Times
A major earthquake with a magnitude of 7.4 struck Chile on Thursday, according to the United States Geological Survey.
According to agency data, the quake struck at 9:50 p.m. Chilean time, about 28 miles southeast of San Pedro de Atacama, Chile.
Seismologists may revise the reported magnitude of an earthquake when reviewing available data. Additional information gathered about an earthquake may also prompt USGS scientists to update the earthquake-intensity map.
Earthquake tremors in the area
An aftershock is usually a smaller earthquake that follows a larger earthquake in the same general area. Aftershocks are usually minor shifts in the part of the fault that slipped during the initial earthquake.
Earthquake and tremors within a 100 mile radius
Aftershocks may occur several days, weeks, or even years after the first earthquake. These events may be as intense or even greater than the initial earthquake, and may continue to affect already damaged locations.
Source: United States Geological Survey | Note: Tremor categories are based on the following modified mercali intensity Scale. When aftershock data is available, the associated maps and charts include earthquakes within 100 miles and seven days of the initial earthquake. All times above are Chile Summer Time. Earthquake data is as of Thursday, July 18 at 10:19 p.m. Eastern Time. Aftershock data is as of Friday, July 19 at 1:21 a.m. Eastern Time.
