About SPUD

SPUD Version 3.0

The Searchable Product Depository (SPUD) is the IRIS DMC's primary data product management system. Complementing the DMC's SEED and assembled data archives, which contain time series recordings, the SPUD system primarily contains derivative data products of other types (images, movies, etc.) created either at the DMC or by members of the community.

For users SPUD is the query and access point for these products. The web interfaces allow users to search for products using customized queries across product and event details. Users can search across all product types at once or within specific product types. SPUD also has web service interfaces for programmatic discovery and access to the data products.

If any products from SPUD are used in your research please be sure to cite the identified author of the product and the IRIS DMS [Citation Information].

About Moment Tensor Products

Global Centroid-Moment-Tensors from the GCMT project at Lamont-Doherty Earth Observatory are available through SPUD within minutes after their publication. Initial quick-CMT solutions are shown and are later updated to GCMT solutions when updates arrive. The download button gives users the full NDK format solution. For more info, visit: www.globalcmt.org.

Citing Global Centroid-Moment-Tensor Products

If you use Moment Tensors in publications, please cite according to the instructions at:


When citing this Moment Tensor page please use the Digital Object Identifier (DOI):


Moment Tensor Help

The page displays information for individual Moment Tensors.

The centroid origin is displayed next to the primary origin from the IRIS database followed by the moment tensor details.

Moment Tensor for MW 7.4 (GCMT) QINGHAI, CHINA icon
Centroid Event
Date-Time (UTC): 2021-05-21 18:04:29
Latitude, Longitude: 34.650 °, 98.460 °
Magnitude: 7.4 MW
Depth: 12.0 km
Author: Global CMT Project
Catalog, Contributor: GCMT, GCMT
Date-Time (UTC): 2021-05-21 18:04:13
Latitude, Longitude: 34.588 °, 98.240 °
Magnitude: 7.3 Mww (us)
Depth: 10.0 km
Author: us,usauto,pt,at
Catalog, Contributor: NEIC PDE, us
Related Products:
CMT Details
Event ID C202105211804A
Timestamp: Q-20210521194132
CMT Version: Quick
NDK Version: V10
Reference Catalog: PDEQ
Source Zero Trace
Moment Rate Fn: TRIHD
Half Duration: 12.5
Depth Determination: FIX
Scalar Moment 1.707 e+27 (dyne-cm)
Focal Mechanism
Moment Tensor (Exponent: 27, Units: dyne-cm)
Principal Axes (Length Exponent: 27, Units: dyne-cm)
NameAzimuth (°)Plunge (°)Length
Nodal Planes
NameStrike (°)Dip (°)Rake (°)
Data Used in Inversion
TypeStationsComponentsShortest Period (s)
Body Waves17144350
Mantle Waves172463150
Surface Waves17144350
Event Location
Source NDK
PDEQ 2021/05/21 18:04:13.7  34.59   98.25  10.0 0.0 7.3 QINGHAI, CHINA          
C202105211804A   B:171  443  50 S:171  443  50 M:172  463 150 CMT: 1 TRIHD: 12.5
CENTROID:     15.4 0.1  34.65 0.00   98.46 0.01  12.0  0.0 FIX  Q-20210521194132
27 -0.220 0.004  0.840 0.004 -0.620 0.004  0.186 0.045 -0.224 0.044  1.510 0.003
V10   1.788  1 328  -0.162 78  63  -1.626 12 238   1.707  13 81 -173 282 83   -9

Other Formats
Other Products For This Event
Product TypeDescriptionOrganization
Global ShakeMovie syntheticGlobal ShakeMovie synthetic for MW 7.4 QINGHAI, CHINAIRIS
Back ProjectionsBack Projections for Mww 7.3 QINGHAI, CHINAIncorporated Research Institutions for Seismology
Surface-Wave Radiation PatternsSurface-Wave Radiation Patterns for MW 7.4 QINGHAI, CHINAIncorporated Research Institutions for Seismology
EQ EnergyEQ Energy for Mww 7.3 QINGHAI, CHINAIncorporated Research Institutions for Seismology
Source Time FunctionSource Time Function for Mww 7.3 QINGHAI, CHINAIncorporated Research Institutions for Seismology
AftershocksAftershocks for Mww 7.3 QINGHAI, CHINAIRIS DMC
Event PlotsEvent Plots for Mww 7.3 QINGHAI, CHINAIncorporated Research Institutions for Seismology
GMVGMV for Mww 7.3 QINGHAI, CHINAIncorporated Research Institutions for Seismology