Global CMT Search

This searches the copy of the Global Centroid Moment Tensor (CMT) database held locally but drawn from GCMT sources. (This catalog used to be known informally as the Harvard CMT Catalog, but its' host institution changed, so the name was changed to be generic.) CMT solutions are derived from long period seismic waves, so give a time-averaged hypocentral location and focal mechanism over the rupture duration of the earthquake. Thus the CMT hypocenter and focal mechanism in general differs from other determinations that use first motion information from short period instruments (e.g. the International Seismological Centre (ISC) catalog).

A search may be made in a couple of different ways, and these choices are indicated in the form.

Search results described here.

Send comments or questions to George Helffrich.

Date range:

From To

Search type:

Latitude/Longitude box:

Min lat. Max lat.
Min lon. Max lon.

Distance range (in degrees) from a latitude/longitude point:

Lat. Lon.
Low distance range High distance range

Depth range (kilometers):

None Shallowest: Deepest:

Minimum size cutoff (moment or magnitude):

None Magnitude (Mw) Moment (dyne-cm)× 10**

Bulletin or Centroid parameters (location and depth):

Bulletin Centroid

Expect a search to take up to a few seconds. It depends on the time span of the search.