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:


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Event Criteria
Depth (km)
Max Lat:
Min Lon: Max Lon:
Min Lat:
Query Results: 980 items found
ppPage: 1 of 10pp
Event Time (UTC)Depth (km)Trigger MagLatitudeLongitudeRegion
2024-05-26 20:47:09112.2356.6-19.38-174.87TONGA ISLANDS
2024-04-27 08:35:34503.1566.527.83139.57BONIN ISLANDS, JAPAN REGION
2024-04-14 20:56:2849.06.5-5.82151.10NEW BRITAIN REGION, P.N.G.
2024-04-09 09:48:0135.06.62.71127.09NORTHERN MOLUCCA SEA
2024-04-05 11:03:16222.06.819.10145.39MARIANA ISLANDS
2024-04-02 23:58:1134.757.423.82121.56TAIWAN
2024-03-27 01:28:2110.06.7-20.90173.80VANUATU ISLANDS REGION
2024-03-03 16:16:5210.06.7-58.94159.05MACQUARIE ISLAND REGION
2024-01-28 09:38:56609.4746.5-8.22-71.37WESTERN BRAZIL
2024-01-20 21:31:07628.8136.5-7.32-71.51WESTERN BRAZIL
2024-01-08 20:48:4268.0176.74.86126.19TALAUD ISLANDS, INDONESIA
2024-01-01 07:10:0910.07.537.50137.24NEAR WEST COAST OF HONSHU, JAPAN
2023-12-30 17:16:2310.06.5-3.20139.29IRIAN JAYA, INDONESIA
2023-12-28 09:15:1523.8446.544.58148.99KURIL ISLANDS
2023-12-07 12:56:3048.3647.1-20.66169.21VANUATU ISLANDS
2023-11-27 21:46:4312.3326.5-3.56144.02NEAR N COAST OF NEW GUINEA, PNG.
2023-11-24 09:05:0316.0336.920.16145.55MARIANA ISLANDS
2023-11-22 04:47:3322.5236.7-14.99167.98VANUATU ISLANDS
2023-11-17 08:14:1377.9856.75.59125.05MINDANAO, PHILIPPINES
2023-11-08 04:53:5110.07.1-6.46129.51BANDA SEA
2023-11-08 04:52:5210.06.7-6.38129.78BANDA SEA
2023-10-31 12:33:4335.06.6-28.75-71.57NEAR COAST OF CENTRAL CHILE
2023-10-31 11:10:56549.7886.5-17.52-179.01FIJI ISLANDS REGION
2023-10-16 11:35:30253.06.753.10-175.50ANDREANOF ISLANDS, ALEUTIAN IS.
2023-09-08 22:11:0118.5356.831.11-8.44MOROCCO
2023-09-08 09:09:5889.816.6-32.72-179.31SOUTH OF KERMADEC ISLANDS
2023-08-28 19:55:32515.7757.1-6.78116.57BALI SEA
2023-08-16 12:47:40192.9556.5-13.88167.16VANUATU ISLANDS
2023-07-19 00:22:0769.7276.512.81-88.13OFF COAST OF CENTRAL AMERICA
2023-07-17 03:05:10171.3716.6-38.19-70.37SOUTHERN ARGENTINA
2023-07-16 06:48:2232.5717.254.46-160.76ALASKA PENINSULA
2023-07-10 20:28:2510.06.620.04-61.08NORTH ATLANTIC OCEAN
2023-07-02 10:27:43224.9756.9-17.85-174.94TONGA ISLANDS
2023-06-15 18:06:27167.4047.2-22.98-177.21SOUTH OF FIJI ISLANDS
2023-05-25 03:05:3310.06.68.89-77.12PANAMA-COLOMBIA BORDER REGION
2023-05-21 14:56:4510.06.8-43.4439.37PRINCE EDWARD ISLANDS REGION
2023-05-20 01:51:0135.9817.1-23.06170.46SOUTHEAST OF LOYALTY ISLANDS
2023-05-19 02:57:0637.7487.7-23.23170.69SOUTHEAST OF LOYALTY ISLANDS
2023-05-10 16:02:00210.0977.6-15.60-174.61TONGA ISLANDS
2023-04-28 03:13:51598.4676.6-25.27178.42SOUTH OF FIJI ISLANDS
2023-04-24 20:00:5515.4627.1-0.7898.53SOUTHERN SUMATRA, INDONESIA
2023-04-24 00:41:5649.0357.1-29.95-177.84KERMADEC ISLANDS, NEW ZEALAND
2023-04-18 04:31:41562.4746.6-22.28179.39SOUTH OF FIJI ISLANDS
2023-04-14 09:55:45594.0287.0-6.03112.03JAVA, INDONESIA
2023-04-03 03:06:57105.6316.552.78158.48NEAR EAST COAST OF KAMCHATKA
2023-04-02 18:04:1062.6037.0-4.29143.15NEW GUINEA, PAPUA NEW GUINEA
2023-03-22 16:00:31209.9766.5-23.48-66.51JUJUY PROVINCE, ARGENTINA
2023-03-21 16:47:23187.5896.536.5270.98HINDU KUSH REGION, AFGHANISTAN
2023-03-18 17:12:5266.4216.8-2.83-79.86NEAR COAST OF ECUADOR
2023-03-16 00:56:0222.0657.0-30.11-176.11KERMADEC ISLANDS REGION
2023-03-04 06:41:22205.6816.9-29.47-178.79KERMADEC ISLANDS, NEW ZEALAND
2023-03-02 18:04:2910.06.5-15.41166.37VANUATU ISLANDS
2023-03-01 05:36:15598.9256.5-4.81149.49BISMARCK SEA
2023-02-23 00:37:4020.5226.838.0773.21TAJIKISTAN-XINJIANG BORDER REG.
2023-02-06 10:24:4910.07.538.0237.20TURKEY
2023-02-06 01:17:3517.9257.837.1737.03TURKEY
2023-01-20 22:09:39610.6716.8-26.72-63.04SANTIAGO DEL ESTERO PROV., ARG.
2023-01-09 17:47:3495.1737.6-7.09130.04TANIMBAR ISLANDS REG., INDONESIA
2023-01-08 12:32:4227.7197.0-14.94166.88VANUATU ISLANDS
2022-12-04 19:24:1535.9996.7-15.40-172.97SAMOA ISLANDS REGION
2022-11-22 02:03:0715.07.0-9.81159.60SOLOMON ISLANDS
2022-11-18 13:37:0825.06.9-4.89100.80SOUTHWEST OF SUMATRA, INDONESIA
2022-11-12 07:09:14587.1897.0-20.12-178.36FIJI ISLANDS REGION
2022-11-11 10:48:4524.7977.3-19.32-172.10TONGA ISLANDS REGION
2022-11-09 09:51:04665.2677.0-26.04178.38SOUTH OF FIJI ISLANDS
2022-11-09 09:38:42628.9236.8-25.97178.36SOUTH OF FIJI ISLANDS
2022-11-09 09:38:41652.96.7-26.04178.58SOUTH OF FIJI ISLANDS
2022-10-20 11:57:1110.06.77.67-82.34SOUTH OF PANAMA
2022-10-16 12:48:2410.06.74.40-87.50OFF COAST OF CENTRAL AMERICA
2022-09-29 03:03:2411.06.5-60.82-19.97EAST OF SOUTH SANDWICH ISLANDS
2022-09-22 06:16:0920.7076.818.33-102.91MICHOACAN, MEXICO
2022-09-19 18:05:0615.1347.618.37-103.25NEAR COAST OF MICHOACAN, MEXICO
2022-09-18 06:44:1410.06.923.16121.32TAIWAN
2022-09-17 13:41:1710.06.523.10121.41TAIWAN
2022-09-14 11:04:07144.8857.0-21.19170.24SOUTHEAST OF LOYALTY ISLANDS
2022-09-10 23:46:5790.0137.6-6.26146.47EASTERN NEW GUINEA REG., P.N.G.
2022-09-05 04:52:1910.06.629.73102.28SICHUAN, CHINA
2022-09-04 09:42:2210.06.8-0.80-21.80CENTRAL MID-ATLANTIC RIDGE
2022-09-04 09:42:1810.06.9-0.95-21.72CENTRAL MID-ATLANTIC RIDGE
2022-08-14 13:44:2039.086.6-32.77-179.01SOUTH OF KERMADEC ISLANDS
2022-07-27 00:43:2410.07.117.60120.81LUZON, PHILIPPINES
2022-07-12 19:17:0233.06.6-22.78-114.63EASTER ISLAND REGION
2022-06-08 00:55:46616.246.5-9.06-71.16PERU-BRAZIL BORDER REGION
2022-05-26 12:02:20217.837.2-14.86-70.31CENTRAL PERU
2022-05-19 10:13:3110.06.9-54.14159.08MACQUARIE ISLAND REGION
2022-05-10 23:06:29193.816.8-23.61-66.72JUJUY PROVINCE, ARGENTINA
2022-04-21 07:42:4625.336.711.55-86.99NEAR COAST OF NICARAGUA
2022-03-31 05:44:0110.07.0-22.58170.35SOUTHEAST OF LOYALTY ISLANDS
2022-03-30 20:56:5810.06.9-22.72170.29SOUTHEAST OF LOYALTY ISLANDS
2022-03-22 17:41:3924.06.723.41121.56TAIWAN
2022-03-22 16:35:0810.06.710.75-43.38NORTHERN MID-ATLANTIC RIDGE
2022-03-16 14:36:3363.077.337.70141.59NEAR EAST COAST OF HONSHU, JAPAN
2022-03-13 21:09:2121.86.7-0.6698.61SOUTHERN SUMATRA, INDONESIA
2022-03-13 21:06:0033.06.714.10119.40LUZON, PHILIPPINES
2022-03-13 21:05:5233.06.714.07119.41LUZON, PHILIPPINES
2022-03-02 12:52:0936.216.6-30.06-177.77KERMADEC ISLANDS, NEW ZEALAND
2022-02-16 20:21:06528.16.8-23.79-179.97SOUTH OF FIJI ISLANDS
2022-02-03 15:58:56100.316.5-4.45-76.94NORTHERN PERU
2022-01-14 09:05:4237.196.6-6.93105.25SUNDA STRAIT, INDONESIA
2022-01-11 12:39:3111.236.652.60-168.15FOX ISLANDS, ALEUTIAN ISLANDS
ppPage: 1 of 10pp