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What Caused the Recent Earthquakes in the SW Pacific Region?
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[QUOTE="davenn, post: 6055174, member: 283516"] OK this does happen from time to time, actually reasonably regularly. Mainly with a large event with one or more aftershocks buried in the larger events' signal. I personally haven't been able to see, say a, M5.5 aftershock that is buried in the M7.2 mainshock if they have occurred within a minute of each other. here's a recent example …. Main shock [URL='https://earthquake.usgs.gov/earthquakes/eventpage/us1000gcii'][U]M 8.2 - 286km NNE of Ndoi Island, Fiji[/U][/URL] 2018-08-19 00:19:40 (UTC) Aftershock [URL='https://earthquake.usgs.gov/earthquakes/eventpage/us1000gcnc'][U]M 6.3 - 268km NNE of Ndoi Island, Fiji[/U][/URL] 2018-08-19 00:23:06 (UTC) On my recording, I couldn't tell that there were 2 events separated by ~ 4 minutes. But the experts could :smile: [ATTACH=full]230579[/ATTACH]How they do it, I am not sure. Maybe I need to send some emails and see if they will tell me. :biggrin: Now for the same or closely times events that are separated by some distance, then it becomes easy to differentiate the events using a seismograph network. as there will always be one or more sensors in the network that are closer to one of those 2 events that what the other sensors are. It then just becomes a matter of the timing of the P wave arrivals at the various network sensors from which they can then produce locations for the events.hope that helps Dave [/QUOTE]
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What Caused the Recent Earthquakes in the SW Pacific Region?
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