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 8.2 (GCMT) ALASKA PENINSULA icon
Centroid Event
Date-Time (UTC): 2021-07-29 06:16:20
Latitude, Longitude: 55.420 °, -157.320 °
Magnitude: 8.2 MW
Depth: 30.2 km
Author: Global CMT Project
Catalog, Contributor: GCMT, GCMT
Date-Time (UTC): 2021-07-29 06:15:49
Latitude, Longitude: 55.364 °, -157.888 °
Magnitude: 8.2 Mww (us)
Depth: 35.0 km
Author: us,ak,at,pt,usauto
Catalog, Contributor: NEIC PDE, ak
Related Products:
CMT Details
Event ID C202107290615A
Timestamp: Q-20210729055226
CMT Version: Quick
NDK Version: V10
Reference Catalog: PDEQ
Source Zero Trace
Moment Rate Fn: TRIHD
Half Duration: 32.4
Depth Determination: FREE
Scalar Moment 2.959 e+28 (dyne-cm)
Focal Mechanism
Moment Tensor (Exponent: 28, Units: dyne-cm)
Principal Axes (Length Exponent: 28, Units: dyne-cm)
NameAzimuth (°)Plunge (°)Length
Nodal Planes
NameStrike (°)Dip (°)Rake (°)
Data Used in Inversion
TypeStationsComponentsShortest Period (s)
Body Waves16341350
Mantle Waves169481200
Surface Waves12227250
Event Location
Source NDK
PDEQ 2021/07/29 06:15:47.5  55.33 -157.84  32.2 0.0 8.2 ALASKA PENINSULA        
C202107290615A   B:163  413  50 S:122  272  50 M:169  481 200 CMT: 1 TRIHD: 32.4
CENTROID:     32.8 0.1  55.42 0.01 -157.32 0.01  30.2  0.4 FREE Q-20210729055226
28  1.040 0.003 -0.767 0.002 -0.271 0.002  2.400 0.042  1.370 0.032 -0.495 0.001
V10   2.943 55 331   0.034  1 240  -2.974 35 150   2.959 236 10   86  60 80   91

Other Formats
Other Products For This Event
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Back ProjectionsBack Projections for Mww 8.2 ALASKA PENINSULAIncorporated Research Institutions for Seismology
Event PlotsEvent Plots for Mww 8.2 ALASKA PENINSULAIncorporated Research Institutions for Seismology
EQ EnergyEQ Energy for Mww 8.2 ALASKA PENINSULAIncorporated Research Institutions for Seismology
GMVGMV for Mww 8.2 ALASKA PENINSULAIncorporated Research Institutions for Seismology
AftershocksAftershocks for Mww 8.2 ALASKA PENINSULAIRIS DMC
Surface-Wave Radiation PatternsSurface-Wave Radiation Patterns for MW 8.2 ALASKA PENINSULAIncorporated Research Institutions for Seismology