| earthquake.usgs.gov | |
| 网站标题： | USGS Earthquake Hazards Program |
| 网站简介： | USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards |
| 关键字： | aftershock earthquake epicenter fault foreshock geologist geophysics hazard hypocenter intensity intensity scale magnitude magnitude scale mercalli plate richter seismic seismicity seismogram seismogr |
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