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 Back Projection Products

The Back Projection (BP) product shows the beamformed time history and location of coherent short period P-wave energy generated by large earthquakes observed at three regional arrays and across the Global Seismic Network. These are automatically generated following all global M6.5+ earthquakes.

Virtual networks are formed by choosing stations within 25 degrees distance or azimuth to the center of three continents (NAmerica, EUrope, AUstralia). All available BHZ data are then aligned using a Multi-Channel Cross Correlation scheme which also downsamples the network by only choosing the stations with the highest average cross-correlation coefficient and at least one degree distance to it's nearest neighboring stations. BPs are performed by beam forming energy using square-root stacking to a flat grid around the source region with variable spatial resolution scaled by the magnitude of the earthquake. A 5 s wide cosine taper is used to average the beams. BP results are then averaged over time windows whose length increases with magnitude.

The upper gallery shows a movie of the combined BPs from all networks with sufficient data. The array response function is also shown which is generated using the same processing techniques and stations, except the raw data are replaced with synthetic seismograms with 5 s wide point-source triangle functions. The first and last frames show cumulative time integrated results. Results are affected by radiation pattern, Greens functions variations and array geometry. Warmer colors indicate greater beam power. A small cross shows the location of the peak beam power when absolute beam powers are low.

The lower gallery shows a summary figure for each array's BP as well as the individual array movie. In the summary figure, the lower left panel shows the time and location of local maxima. The colors correspond to relative time and the diameter to relative beam power. The other panels show the time-integrated results, the source-receiver geometry, and the MCCC aligned traces.

At the bottom of the page, text files with peak beam power (and their Lat/Lon location) as a function of time relative to origin are given for both the data and the synthetic ARF.

For more information on Back Projections visit the Backprojection product page.

This product is automatically generated without human review.

Back Projection Query Help

This page queries for Back Projection products.

Citing Back Projection Products

If you use Back Projections in publications, please cite according to the instructions at:


Download request too large

Requested download count exceeds maximum size (200) for this product.

Back Projection Product Query
Your session is about to expire!

Your session will expire in seconds.

Do you wish to continue?

Event Criteria
Depth (km)
Max Lat:
Min Lon: Max Lon:
Min Lat:
Query Results: 871 items found
ppPage: 1 of 9pp
Event Time (UTC)Depth (km)Trigger MagLatitudeLongitudeRegion
2021-10-11 09:10:2469.16.956.26-156.55ALASKA PENINSULA
2021-10-10 21:48:3635.066.2118.82-155.53HAWAII
2021-10-09 10:58:28485.166.8-21.17174.54VANUATU ISLANDS REGION
2021-10-02 06:29:18535.797.3-21.10174.89VANUATU ISLANDS REGION
2021-09-22 09:57:0830.746.512.16-87.85NEAR COAST OF NICARAGUA
2021-09-08 01:47:4820.07.016.99-99.78NEAR COAST OF GUERRERO, MEXICO
2021-08-22 21:33:2014.07.1-60.29-24.90SOUTH SANDWICH ISLANDS REGION
2021-08-22 00:45:0811.06.8-60.12-24.34SOUTH SANDWICH ISLANDS REGION
2021-08-18 10:10:0489.456.9-14.86167.10VANUATU ISLANDS
2021-08-16 11:10:3613.956.9-58.36-23.34SOUTH SANDWICH ISLANDS REGION
2021-08-14 12:29:0910.07.218.35-73.48HAITI REGION
2021-08-14 11:57:4433.36.955.08-157.54ALASKA PENINSULA
2021-08-12 18:35:2048.258.1-58.42-25.32SOUTH SANDWICH ISLANDS REGION
2021-08-12 18:32:5463.257.5-57.60-25.19SOUTH SANDWICH ISLANDS REGION
2021-08-11 17:46:1465.67.16.45126.74MINDANAO, PHILIPPINES
2021-07-29 06:15:4946.668.255.47-157.92ALASKA PENINSULA
2021-07-23 20:48:57112.06.713.70120.71MINDORO, PHILIPPINES
2021-07-21 21:15:1210.06.77.42-82.79SOUTH OF PANAMA
2021-05-21 22:13:1810.06.5-16.60-177.35FIJI ISLANDS REGION
2021-05-21 18:04:1310.07.334.5998.25QINGHAI, CHINA
2021-05-19 00:42:2010.06.7-33.08-109.32SOUTHERN EAST PACIFIC RISE
2021-05-14 06:33:0710.06.60.1796.65OFF W COAST OF NORTHERN SUMATRA
2021-05-01 01:27:2747.36.838.23141.66NEAR EAST COAST OF HONSHU, JAPAN
2021-04-03 01:16:3910.06.6-57.99-7.81EAST OF SOUTH SANDWICH ISLANDS
2021-03-20 09:09:4554.07.038.48141.61NEAR EAST COAST OF HONSHU, JAPAN
2021-03-16 18:38:2222.066.654.70163.21OFF EAST COAST OF KAMCHATKA
2021-03-04 19:28:3119.48.1-29.74-177.27KERMADEC ISLANDS, NEW ZEALAND
2021-03-04 17:41:2555.577.4-29.61-177.84KERMADEC ISLANDS, NEW ZEALAND
2021-03-04 13:27:3510.06.9-37.60179.54OFF E. COAST OF N. ISLAND, N.Z.
2021-02-13 14:07:4954.07.037.69141.99NEAR EAST COAST OF HONSHU, JAPAN
2021-02-10 13:20:0010.07.7-23.25171.49SOUTHEAST OF LOYALTY ISLANDS
2021-02-03 05:23:4110.06.9-36.43-98.16SOUTHEAST OF EASTER ISLAND
2021-01-23 23:36:507.767.0-61.85-55.56SOUTH SHETLAND ISLANDS
2021-01-21 12:23:0595.817.05.01127.52PHILIPPINE ISLANDS REGION
2021-01-11 21:32:5810.06.751.24100.44RUSSIA-MONGOLIA BORDER REGION
2020-12-27 21:39:1510.06.7-39.35-74.91OFF COAST OF CENTRAL CHILE
2020-10-30 11:51:2610.07.037.9026.80DODECANESE ISLANDS, GREECE
2020-10-19 20:54:4040.127.554.66-159.68SOUTH OF ALASKA
2020-09-06 06:51:1910.06.67.70-37.24CENTRAL MID-ATLANTIC RIDGE
2020-09-01 21:09:1714.266.5-27.93-71.39NEAR COAST OF NORTHERN CHILE
2020-09-01 04:09:2823.06.8-28.01-71.24NEAR COAST OF CENTRAL CHILE
2020-08-30 21:20:2810.06.50.87-29.70CENTRAL MID-ATLANTIC RIDGE
2020-08-21 04:09:52627.336.9-6.67123.49BANDA SEA
2020-08-18 22:29:2426.06.9-4.28101.23SOUTHERN SUMATRA, INDONESIA
2020-08-18 22:23:5922.06.8-4.35101.13SOUTHERN SUMATRA, INDONESIA
2020-08-18 00:03:4810.06.712.01124.11SAMAR, PHILIPPINES
2020-07-22 06:12:4210.07.855.10-158.47ALASKA PENINSULA
2020-07-17 02:50:2379.797.0-7.84147.77EASTERN NEW GUINEA REG., P.N.G.
2020-07-06 22:54:46528.666.6-5.64110.68JAVA SEA
2020-06-23 15:29:0526.257.416.03-95.90OAXACA, MEXICO
2020-06-18 12:49:5310.07.4-33.29-177.84SOUTH OF KERMADEC ISLANDS
2020-06-13 15:51:24164.796.728.95128.30RYUKYU ISLANDS, JAPAN
2020-06-03 07:35:3496.846.8-23.30-68.42NORTHERN CHILE
2020-05-15 11:03:274.16.538.16-117.88NEVADA
2020-05-12 22:41:12112.366.6-12.11166.57SANTA CRUZ ISLANDS
2020-05-06 13:53:56107.06.8-6.79129.86BANDA SEA
2020-05-02 12:51:0616.996.634.2025.71CRETE, GREECE
2020-04-18 08:25:37453.776.627.14140.11BONIN ISLANDS, JAPAN REGION
2020-03-31 23:52:3110.06.544.45-115.14WESTERN IDAHO
2020-03-25 02:49:2156.657.548.99157.69EAST OF KURIL ISLANDS
2020-02-13 10:33:44142.586.945.67148.89KURIL ISLANDS
2020-01-28 19:10:2510.07.719.44-78.75CUBA REGION
2020-01-24 17:55:1410.06.738.3339.08TURKEY
2020-01-07 08:24:2710.06.517.95-66.74PUERTO RICO REGION
2019-12-15 06:11:5228.196.86.72125.21MINDANAO, PHILIPPINES
2019-11-14 16:17:4145.147.11.59126.42NORTHERN MOLUCCA SEA
2019-11-08 10:44:44582.926.5-21.97-179.49FIJI ISLANDS REGION
2019-11-04 22:43:3213.376.6-18.57-175.25TONGA ISLANDS
2019-10-31 01:11:1910.06.56.93125.24MINDANAO, PHILIPPINES
2019-10-29 01:04:4415.326.66.80125.04MINDANAO, PHILIPPINES
2019-09-29 15:57:5415.756.8-35.47-73.13OFF COAST OF CENTRAL CHILE
2019-09-25 23:46:4418.166.5-3.45128.35SERAM, INDONESIA
2019-09-01 15:54:21604.116.7-20.36-178.59FIJI ISLANDS REGION
2019-08-27 23:55:2024.56.6-60.21-26.53SOUTH SANDWICH ISLANDS REGION
2019-08-02 12:03:2752.766.9-7.27104.82SOUTHWEST OF SUMATRA, INDONESIA
2019-08-01 18:28:0510.06.8-34.23-72.30NEAR COAST OF CENTRAL CHILE
2019-07-31 15:02:33179.116.6-16.16167.95VANUATU ISLANDS
2019-07-14 09:10:5010.07.3-0.53128.09HALMAHERA, INDONESIA
2019-07-14 05:39:2410.06.6-18.20120.34WESTERN AUSTRALIA
2019-07-07 15:08:3924.946.90.55126.23NORTHERN MOLUCCA SEA
2019-07-06 03:19:5217.07.135.77-117.60CENTRAL CALIFORNIA
2019-06-24 02:53:40208.257.3-6.39129.22BANDA SEA
2019-06-15 22:55:0234.47.2-30.81-178.09KERMADEC ISLANDS, NEW ZEALAND
2019-06-14 00:19:1010.06.5-30.04-72.16OFF COAST OF CENTRAL CHILE
2019-05-30 09:03:3265.086.613.24-89.27EL SALVADOR
2019-05-26 07:41:14109.888.0-5.80-75.30NORTHERN PERU
2019-05-14 12:58:2610.07.5-4.08152.57NEW BRITAIN REGION, P.N.G.
2019-05-06 21:19:35126.927.2-6.98146.44EASTERN NEW GUINEA REG., P.N.G.
2019-04-18 14:46:0110.06.5-51.06139.49WESTERN INDIAN-ANTARCTIC RIDGE
2019-04-12 11:40:4917.486.8-1.85122.55SULAWESI, INDONESIA
2019-04-09 17:54:0047.76.5-58.61-25.36SOUTH SANDWICH ISLANDS REGION
2019-04-05 16:14:1658.416.5-55.93-27.85SOUTH SANDWICH ISLANDS REGION
2019-04-02 21:35:3219.056.552.21178.02RAT ISLANDS, ALEUTIAN ISLANDS
2019-03-01 08:50:41257.427.0-14.68-70.13CENTRAL PERU
2019-02-22 10:17:22132.367.5-2.20-77.02PERU-ECUADOR BORDER REGION
2019-02-01 16:14:1367.936.614.76-92.30NEAR COAST OF CHIAPAS, MEXICO
2019-01-22 19:01:4310.06.7-43.0842.23PRINCE EDWARD ISLANDS REGION
2019-01-20 01:32:5153.046.7-30.07-71.42NEAR COAST OF CENTRAL CHILE
2019-01-15 18:06:3646.856.6-13.40166.71VANUATU ISLANDS
2019-01-06 17:27:2060.06.62.22126.74NORTHERN MOLUCCA SEA
ppPage: 1 of 9pp