It didnt just happen.It was created by the repitition of different sized earthquakes that happen of the breakers in the earth's crust called fault lines
Port Hills Fault happened in 2011.
The fault line can be traced across Batasan Hills. So in some areas, the distance is zero!
Portland Rum Riot happened in 1855.
Battle of Portland happened on 1653-02-28.
Battle of Portland Harbor happened on 1863-06-27.
look for chocolate hills in bohol type that in google
Verdugo Hills Cemetery happened in 1978.
Cypress Hills massacre happened in 1873.
Battle of the Cranita hills happened in -277.
Bald Hills War happened in 1858.
Battle of the Hills happened on 1917-04-20.
Baldwin Hills Reservoir happened in 1963.