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Region
- United States122
- Antarctica12
- CaliforniaLoma Prieta12
- CaliforniaSan Francisco Bay Area11
- Arctic regions7
- Soviet Union5
- AntarcticaPensacola Mountains3
- AntarcticaVictoria Land3
- Asia3
- Alaska2
- AntarcticaAntarctic Peninsula2
- AntarcticaEllsworth Land2
- AntarcticaLassiter Coast2
- California2
- Europe, Eastern2
- PhilippinesLuzon2
- SpainAlmería (Province)2
- Yugoslavia2
- Africa, Sub-Saharan1
- AntarcticaOrville Coast1