School Seismology

View of Aleutian islands

An ex-pupil visiting us at Paulet was most impressed with the seismometer and the display showing the two earthquake traces from the Aleutian islands, an area he is familiar with as he is in the Merchant navy and passes through the area at least once a year, in fact his next tour takes him through the Aleutians. He sent a photograph he took last time, shows what a desolate area it is.

Keywords: Aleutians, Earthquake, Paulet

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Paul Denton @ School Seismology

US schools data from Aleutians

An interesting pair of events (see attached image from the WLIN AS-1 station) from the Aleutian Islands of Alaska. Preliminary USGS magnitudes are 6.3 and 6.5. The seismograms are very similar! Although most large earthquakes are single events (with aftershocks following the main shock), pairs of earthquakes (approximately the same size and location and occurring within hours or days of each other), or even triplets, are not uncommon.
-Larry Braile

Web page: http://web.ics.purdue.edu/~braile

Keywords: Aleutian, BRAILE, USA

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Pete Hill @ School Seismology

Aleutian Isles:PAUL Data

Checking my e-mail this morning the e-mail alert from USGS flagged up the M 6.6 event at 05:54:23 today, checking the seismometer display clearly showed the trace and the earlier M 6.5 event at 22:59:55 yesterday. The USGS site shows there to have been 72 events of various magnitude since the M6.5 event 15/04/08 along the Aleutian island chain.

Pete Hill

Paulet High school

Keywords: Aleutian isles, PAUL, USGS

Posted by Pete Hill @ School Seismology | 1 comment(s)

Paul Denton @ School Seismology

Aleutian Islands

A series of events last night offshore Alaska were detected. They were not especially large (M6.3 and M6.5) but because teh background noise levels were very low overnight both events were picked up at KEYW.
At 75 degrees you would expect to see direct P and S arrivals for these events. However on the horizontal SEP seismometer at KEYW the first identifiable phase is the S arrivals after approx 16 minutes

Keywords: Aleutian, Earthquake, KEYW

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Paul Denton @ School Seismology

Macquerie islands

Mw=7.3 on 12th April a very distant event with an almost 2 hour record of signals by the time they reach the UK

Keywords: earthquake, event, keyw

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Paul Denton @ School Seismology

NULC data

NULC just sent in their record of the Loyalty Island event predicted arrivals for this event are
PKP 13:05 PP 13:09 SS 13:28 Surface 14:00-14:30
It looks as though a M6.0 aftershock is showing up at 15:07

Keywords: earthquake, loyalty, nulc

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Paul Denton @ School Seismology

M7.5 event in Loyalty Islands

An M7.5 event in the Loyalty Islands region at 12:46 this afternoon. There were a couple of largish pre-shocks in the same area this morning (M6.4 and M5.9 but these did not register in teh UK) As I am writing this the body waves have already reached Keyworth with an unusually clear PKP arrival, (a P wave that has travelled right through the centre of teh earth !). AT 146 degrees away we cannot see direct S arrivals or direct P arrivals (we are in tehshadow zone) The Surface waves are due within the next few minutes but the event was so deep (88km according to the USGS) that I am not expecting too much from them.

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Paul Denton @ School Seismology

Aftershock at Market rasen

The long awaited aftershocks at Market Rasen... KEYW and PAUL managed to get really nice records from the M2.8 event on 5th April The data looks much better than the original event data since the electronics were not saturated by the strength of the signal this time (very clear P and S arrivals) . Also over Easter station NULC found its first record (from the M7.2 China event )

Keywords: earthquake, keyw, nulc market rasen

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Paul Denton @ School Seismology

Data from Fulston Manor School

I made a quick visit to Fulston Manor school today to see how they are getting on with their Guralp_EDU seismometer. They have it installed under a mobile classroom (with the cable coming through a hole in the floor) and managed to get it set up and running in time to see the Market Rasen event and also got a good record from the China Event. On the China Event you can seed clear arrivals for P, S, SS and surface waves (see amaseis plot)

.sac data files from FULS
20080220_075337_W41270_B165Z2.sac 20080227_005637_W41270_B165Z2.sac
20080225_080727_W41270_B165Z2.sac 20080320_221514_W41270_B165Z2.sac

Keywords: Earthquake, Fulston

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Paul Denton @ School Seismology

China data now on www.bgs.ac.uk/schoolseismology

BGS web staff are now back at work after the Easter break and data from the M7.2 China event is now available to download at www.bgs.ac.uk/schoolseismology . If you have any data you want added to this site there is a form at
http://www.bgs.ac.uk/scripts/school_seismology/add_recording

Keywords: 20mar2008, earthquake, event

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