Jisho

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Noun
1. deep earthquake; deep-focus earthquakeSee also 浅発地震
Wikipedia definition
2. Depth of focus (tectonics)In seismology, the depth of focus refers to the depth at which an earthquake occurs. Earthquakes occurring at a depth of less than 70 km are classified as 'shallow-focus' earthquakes, while those with a focal-depth between 70 and 300 km are commonly termed 'mid-focus' or 'intermediate-depth' earthquakes.
Read “Depth of focus (tectonics)” on English Wikipedia
Read “深発地震” on Japanese Wikipedia
Read “Depth of focus (tectonics)” on DBpedia

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