What caused the 2014 Solomon Islands earthquake and Alaska earthquake?

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A Mw 6.0 earthquake occurred offshore, 160 km SSW of Gizo, Solomon Islands, on September 25, 2014, at 0913.50 UT. This event was notable but not the largest in the last 24 hours, as a Mw 6.2 quake followed later near Willow, Alaska. Due to its depth and distance, the Gizo quake's surface waves were less pronounced, with identifiable waves recorded between 1830 and 1859 UT. The observer is located approximately 2815 km from the quake's epicenter, and both P and S wave phases are clearly distinguishable, with the vertical component being analyzed. A preliminary calculation indicates a P wave travel time of about 4 to 5 minutes, aligning closely with the expected arrival time based on the distance.
davenn
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hi guys and gals
latest reasonable event recorded on my system
2014-09-25 0913.50UT Mw 6.0, offshore, 160km SSW of Gizo, Solomon Islands

140925 0913UT M6.0 offshr SW Solomons zhi.gif
Not the largest event in the last 24 Hrs. it was followed by a Mw 6.2, 94km WNW of Willow, Alaska at 1751UT. but because of its depth and distance, it doesn't show up well ... see the small set of surface waves between ~ 1830 and 1859UT

cheers
Dave
 
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Hi Dave, what distance are you from the quake? What body wave phases can you identify? Which component is this, vertical?
 
Hi Billiards :)

2815 km +- ~ 10 km, P and S easily identifiable ( will label and re-upload the image) Yes this is vertical

140925 0913UT M6.0 offshr SW Solomons zhia.GIF


just a quick "back of envelope" calculation

P velocity ~ 7.5 km / sec for 2800 km = 6.22 minutes

Quake origin time 0913.50UT P arrival time ~ 0918UT ( I haven't done analysis yet so just going by the view on seismogram) P travel time 4 - 5 minutes

that's not too far out ;)cheers
Dave
 
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