Jan 292015
 
20150128 Rutland Earthquake

Oakham Earthquake

A moderate (for the UK) M3.8 earthquake occurred last night near Oakham in Rutland, England. The recording above made at the University of Keele on our 6TD seismometer shows the three-components of ground motion (up-down; north-south; east-west) and nicely shows the arrival of P-waves and S-waves.

Our record from our SEP-1 school’s seismometer is not too shabby either.

20150128 Rutland Earthquake

Earthquake details from the BGS

Feb 202014
 
20140214 Bristol Channel

20140214 Bristol Channel

Magnitude 4.1 earthquake in the Bristol Channel. Seismogram recorded at Keele University.

Probably associated with the Bristol Channel Fault System or one of the NW-SE strike slip faults that offset it.

Map from PESGB with approximate epicentre highlighted.

PESGB

[Update]
The Bristol Channel Fault System is a major fault zone along which it is thought that the Cornubian Peninsula docked against England and Wales in the Mid-Devonian. However, most UK earthquakes tend to be strike slip events on northerly trending faults due to the current stress regime in the UK (ridge-push from the North Atlantic from the NW + tail end of Alpine compression from the SE). A more likely candidate would be a fault parallel to the NW-SE trending Sticklepath Fault (going from Pembrokeshire and across Devon on the map) that offsets the Bristol Channel Fault System and on which there is evidence of significant strike slip movement during the Cenozoic.

More information from the British Geological Survey

As a comparison with ‘fracking’ events here is a useful chart. The Bristol Channel earthquake would be several centimetres slip on a 1 to 4 kilometre fault, a thousand times more powerful than the largest of the Blackpool events and about 30 million times for powerful than a typical ‘frack’ event.

FaultSizeFaultSlip

Aug 142013
 
20130813 Panama

Our ‘schools’ seismometer at Keele is now running the java version of amaseis software (called jAmaseis). The earthquake yesterday south of Panama (13/08/2013 M6.7) is our first real opportunity to play with the event viewer part of the software. The result is here…

20130813 Panama

First impressions are that the event window could be a bit larger to see more detail in the seismogram.

If you download jAmaseis from IRIS (www.iris.edu) you can now livestream Keele and other seismometers from around the world and pick and locate the events for yourself.