shallow-focus earthquake

shallow-focus earthquake

[′shal·ō ¦fō·kəs ′ərth‚kwāk]
(geophysics)
An earthquake whose focus is located within 70 kilometers of the earth's surface.
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References in periodicals archive ?
325 was hit by a shallow-focus earthquake while it was traveling through Nagaoka in the prefecture at about 200 kph.
Three groups of earthquakes can be distinguished in Figure 2: the first one is related to shallow-focus earthquakes (circles) distributed between the trench and the coastline.
The shallow-focus earthquakes located under the local seismograph network could correspond to deformations in the upper crust, since they usually have depths lower than 25 km.