Assertion: earthquake's depth | /r/HasProperty | shallow focal
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Source sentences:
text: In 1928, Kiyoo Wadati proved the existence of earthquakes occurring well beneath the lithosphere, dispelling the notion that earthquakes occur only with shallow focal depths.
text: Recent evidence suggests that earthquakes in the Valley and Ridge Province and in the Piedmont Province occur at shallow depths (usually less than 15 miles) in the Precambrian crystalline basement rocks (Wheeler and Bollinger, 1984).
text: The earthquake occurred on 25 April 2015 at 11:56 am NST (06:11:26 UTC) at a depth of approximately 15 km (9.3 mi) (which is considered shallow and therefore more damaging than quakes that originate deeper in the ground), with its epicentre approximately 34 km (21 mi) east-southeast of Lamjung, Nepal, lasting approximately fifty seconds.
text: Previously, all earthquakes were considered to have shallow focal depths.