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:

http://ds.iris.edu/ds/products/momenttensor/#citation

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 7.5 (GCMT) TONGA ISLANDS icon
Centroid Event
Date-Time (UTC): 2026-03-24 04:38:02
Location: TONGA ISLANDS
Latitude, Longitude: -18.500 °, -175.140 °
Magnitude: 7.5 MW
Depth: 250.8 km
Author: Global CMT Project
Catalog, Contributor: GCMT, GCMT
Event
Date-Time (UTC): 2026-03-24 04:37:50
Location: TONGA ISLANDS
Latitude, Longitude: -18.668 °, -175.560 °
Magnitude: 7.5 mww (us)
Depth: 229.453 km
Author: us,usauto,pt
Catalog, Contributor: NEIC PDE, us
Related Products:
CMT Details
Event ID C202603240437A
Timestamp: Q-20260324063818
CMT Version: Quick
NDK Version: V10
Reference Catalog: PDEQ
Source Zero Trace
Moment Rate Fn: TRIHD
Half Duration: 14.3
Depth Determination: FREE
Scalar Moment 2.522 e+27 (dyne-cm)
Focal Mechanism
Moment Tensor (Exponent: 27, Units: dyne-cm)
ComponentValueError
Mrr-0.7830.006
Mtt0.5670.005
Mpp0.2150.006
Mrt-0.8010.004
Mrp-2.210.004
Mtp0.5950.005
Principal Axes (Length Exponent: 27, Units: dyne-cm)
NameAzimuth (°)Plunge (°)Length
T124352.473
N25130.097
P27852-2.572
Nodal Planes
NameStrike (°)Dip (°)Rake (°)
NP125915-35
NP22381-103
Data Used in Inversion
TypeStationsComponentsShortest Period (s)
Body Waves14240250
Mantle Waves141393150
Surface Waves14239550
Event Location
Source NDK
PDEQ 2026/03/24 04:37:50.6 -18.67 -175.56 229.5 0.0 7.5 TONGA ISLANDS           
C202603240437A   B:142  402  50 S:142  395  50 M:141  393 150 CMT: 1 TRIHD: 14.3
CENTROID:     11.7 0.1 -18.50 0.00 -175.14 0.00 250.8  0.9 FREE Q-20260324063818
27 -0.783 0.006  0.567 0.005  0.215 0.006 -0.801 0.004 -2.210 0.004  0.595 0.005
V10   2.473 35 124   0.097 13  25  -2.572 52 278   2.522 259 15  -35  23 81 -103
Other Formats
Other Products For This Event
Product TypeDescriptionOrganization
Back ProjectionsBack Projections for mww 7.5 TONGA ISLANDSEarthScope
AftershocksAftershocks for mww 7.5 TONGA ISLANDSIRIS DMC
EQ EnergyEQ Energy for mww 7.5 TONGA ISLANDSIncorporated Research Institutions for Seismology
Event PlotsEvent Plots for mww 7.5 TONGA ISLANDSIncorporated Research Institutions for Seismology
GMVGMV for mww 7.5 TONGA ISLANDSIncorporated Research Institutions for Seismology
Surface-Wave Radiation PatternsSurface-Wave Radiation Patterns for MW 7.5 TONGA ISLANDSIncorporated Research Institutions for Seismology
Contributions