Three different types of data have been used in obtaining a global strain rate model: geodetic velocities, Quaternary fault slip rates, and the style and direction of seismic moment tensors.

At 4281 geodetic sites, a total of 5170 horizontal velocities are used, taken from 86 different (mainly) published studies. All studies use Global Positioning System (GPS) techniques (i.e. no VLBI or DORIS studies). Implicit in our procedure is the assumption that a single rigid body rotation can be applied to the velocity vectors from each individual study (one rotation vector for each study) such that the model velocity field provides a 'best-fit' to the observed vectors that have been rotated into a single model frame of reference. Data files: The rotated geodetic velocity vectors and the angular velocity vectors that have been solved for to rotate the velocity vectors can be found in the Model Results.

Quaternary fault slip rate data are incorporated for the central Asia region [England and Molnar, 1997; Holt et al., 2000, and references therein]. Using Kostrov's summation slip rates are converted in geologic strain rates. Data files:

fault data format description
fault data

Shallow earthquakes (less or eaqual to 40 km) between 1 January 1976 and 31 December 2003 (inclusive) are taken from the Harvard Centroid Moment Tensors (CMT) catalog. See seismic data [1.5 Mb] (all events and their moment tensors) and seismic data format of the data file. In the model, seismic moment tensors are converted into seismic strain rate tensors using Kostrov's summation. The interpolated seismic strain rate field, in turn, is used to place a priori constraints on the style and direction of the model strain rate field obtained from the intepolation of geodetic velocities and geologic strain rates observations. Data files:

earthquake data format description
all earthquake data [1.5 Mb]      .Z compressed [0.4 Mb]
earthquake data in grid mesh [1.5 Mb]      .Z compressed [0.4 Mb]
all earthquake data in GMT psmeca -Sa format [0.6 Mb]
(converted to magnitude from moment using the Hanks and Kanamori [1979] relationship of magnitude = log10(moment/[dyne-cm])/1.5 - 10.7; Hanks, T.C., and H. Kanamori, A moment magnitude scale, J. Geophys. Res., 84, 2348-2350, 1979)

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GPSVEL version 1.0

SCEC version3

USGS velocities

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