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.
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.
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.