Hypo-theses

The Baja California Earthquake was recorded moderately well at Keele University, UK. This was the view on the display monitor in our foyer that greeted me this morning.

Extracting the earthquake from the data stream gives this.

… and trying to fit it to the travel-time curves gives this …

Note that the P-wave is not recorded well. [...]

A very large earthquake, at 8.8, the sixth largest since modern seismic recording began around 1900, has struck off-shore southern Chile. More details from the USGS and Ole Nielsen.

At 107° epicentral distance, Keele is just in the shadow zone so the direct P and S-waves are not recorded. However, even at a distance of almost 12,000 [...]

There was a small earthquake just south of Nantwich, Cheshire on January 31st, 2010 which we recorded here at Keele.

The earthquake magnitude has been determined by the Geological survey to be 1.3

The tremor is most likely related to subsidence or collapse due to dissolution of salt. The bedrock here is the Wilkesley Halite and in [...]

Here is the seismogram of the M7 earthquake in Haiti on January 12, 2010 recorded at Keele University, UK.

This earthquake doesn’t appear to be that well recorded but the P and SS phases are identifiable.

The earthquake was a shallow left-lateral strike-slip earthquake along the Enriquillo-Plaintain Garden fault system, essentially a major component of the plate boundary [...]