Global centroid-moment-tensor (CMT) catalog

Options with the CMT data.

Originally the Harvard CMT catalog.

The CMT method gives two focal planes, one of which is the fault plane and other the auxiliary plane.  The first motions used for the CMT method do not allow a determination of which plane is which, but study of the regional geology sometimes allows that discrimination.  These are FP1 and FP2, and each has a dip and strike.

Field Name Type Length Explanation Example
EVENT_ID string 16   M122604A
MONTH integer 2   12
DAY integer 2   26
YEAR integer 2   2004
TIME string 10 UTC 58:50.0
LAT float 8 Decimal degrees 3.3
LONG float 8 Decimal degrees 95.78
DEPTH float 8 km 10
MB float 8 Body wave magnitude mb (~Richter magnitude) 8.9
MS float 8 Surface wave magnitude MS (~Richter magnitude) 8.9
MECH string 2 Fault type (N= normal, T=thrust, S=strike slip, blank for oblique slip).  Assigned by MICRODEM for color coding on maps and cross sections.
REGION string 30 Description of the location OFF W COAST OF NORTHERN
FP1_STRIKE integer 2 Strike in degrees of the first focal plane 329
FP1_DIP integer 2 Dip (from the horizontal) of the first focal plane,  The dip direction is 90 degrees clockwise from the strike direction.  8
FP2_STRIKE integer 2 Strike of the first focal plane 129
FP2_DIP integer 2 Dip (from the horizontal) of the second focal plane,  The dip direction is 90 degrees clockwise from the strike direction.  83
PLUNGE_1 integer 2 Moment tensor, first eigenvector 52
STRIKE_1 integer 2   36
PLUNGE_2 integer 2 Moment tensor, second eigenvector 3
STRIKE_2 integer 2   130
PLUNGE_3 integer 2 Moment tensor, third eigenvector 38
STRIKE_3 integer 2   222

Data file will be cmt_fault_cent_MMM_YYYY.dbf, named for the last month with data:

Citing the data

References for some of the data sets: 


Last revision 8/8/2017