深源地震

shēnyuándìzhèn
deep earthquake (with epicenter more than 300 km deep)

CEDICT

地震波在地下发源的地点称为「震源」，如发生的深度在地下超过三百公里者，称为「深度地震」。

重編國語辭典

Entry Composition

=1 深 shēn old variant of 深 shēn
=1 深 shēn deep (lit. and fig.)
2 源地 yuándì source area; where something has come from
3 震 zhèn
  1. to shake
  2. to vibrate
  3. to jolt
  4. to quake
  5. excited
  6. shocked
  7. one of the Eight Trigrams 八卦 bāguà, symbolizing thunder
  8. ☳