read this anon:
https://www.usgs.gov/faqs/why-do-so-many-earthquakes-occur-a-depth-10km?qt-news_science_products=0#qt-news_science_products
read this anon:
https://www.usgs.gov/faqs/why-do-so-many-earthquakes-occur-a-depth-10km?qt-news_science_products=0#qt-news_science_products