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

The 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: 703 items found
ppPage: 1 of 8pp
Event Time (UTC)Depth (km)Trigger MagLatitudeLongitudeRegion
2017-04-28 20:23:1941.746.85.48125.08MINDANAO, PHILIPPINES
2017-04-24 21:38:2510.07.1-33.06-72.04OFF COAST OF CENTRAL CHILE
2017-04-05 06:09:1210.06.135.8660.39NORTHERN AND CENTRAL IRAN
2017-04-03 17:40:1511.66.5-22.6225.15BOTSWANA
2017-03-29 04:09:2422.836.656.92162.73NEAR EAST COAST OF KAMCHATKA
2017-03-05 22:47:5428.956.5-6.01149.34NEW BRITAIN REGION, P.N.G.
2017-02-24 17:28:43396.086.9-23.20-178.85SOUTH OF FIJI ISLANDS
2017-02-21 14:09:04597.596.5-19.28-63.90SOUTHERN BOLIVIA
2017-02-10 14:03:4527.96.59.90125.46MINDANAO, PHILIPPINES
2017-01-22 04:30:24153.88.0-6.27155.12SOLOMON ISLANDS
2017-01-19 23:04:2033.596.8-10.35161.28SOLOMON ISLANDS
2017-01-10 06:13:48629.526.94.46122.61CELEBES SEA
2017-01-03 21:52:3115.27.2-19.33176.06SOUTH OF FIJI ISLANDS
2016-12-25 14:22:2733.017.7-43.42-73.90SOUTHERN CHILE
2016-12-21 00:17:15158.716.5-7.53127.87BANDA SEA
2016-12-20 04:21:3235.06.7-10.20161.23SOLOMON ISLANDS
2016-12-17 10:51:12103.197.9-4.51153.45NEW IRELAND REGION, P.N.G.
2016-12-09 19:10:0510.06.9-10.68161.13SOLOMON ISLANDS
2016-12-08 17:38:4641.07.8-10.66161.33SOLOMON ISLANDS
2016-12-08 14:49:4612.086.540.48-126.15OFF COAST OF NORTHERN CALIFORNIA
2016-12-06 22:03:3417.166.45.3196.27NORTHERN SUMATRA, INDONESIA
2016-11-25 14:24:2912.06.539.2774.01SOUTHERN XINJIANG, CHINA
2016-11-24 18:43:4910.37.011.96-88.84OFF COAST OF CENTRAL AMERICA
2016-11-21 20:59:4911.46.937.39141.40NEAR EAST COAST OF HONSHU, JAPAN
2016-11-13 11:02:5623.07.8-42.76173.08SOUTH ISLAND, NEW ZEALAND
2016-10-30 06:40:171.56.642.8613.09CENTRAL ITALY
2016-09-01 16:37:5830.77.1-37.46179.18OFF E. COAST OF N. ISLAND, N.Z.
2016-08-31 03:11:36499.16.7-3.69152.79NEW IRELAND REGION, P.N.G.
2016-08-29 04:29:5810.06.9-0.07-17.81NORTH OF ASCENSION ISLAND
2016-08-24 10:34:5584.16.820.9294.58MYANMAR
2016-08-19 07:32:2210.07.4-55.34-31.94SOUTH GEORGIA ISLAND REGION
2016-08-12 01:26:3616.17.6-22.49173.10LOYALTY ISLANDS REGION
2016-07-29 21:18:25212.47.718.52145.53MARIANA ISLANDS
2016-06-01 22:56:0050.86.5-2.21100.57SOUTHERN SUMATERA, INDONESIA
2016-05-28 09:47:0193.27.3-56.26-27.04SOUTH SANDWICH ISLANDS REGION
2016-05-28 05:38:51416.86.6-22.02-178.16SOUTH OF FIJI ISLANDS
2016-05-18 16:46:4431.06.80.47-79.64NEAR COAST OF ECUADOR
2016-05-18 07:57:0532.46.70.43-79.76NEAR COAST OF ECUADOR
2016-04-29 01:33:3810.06.810.25-103.76NORTHERN EAST PACIFIC RISE
2016-04-28 19:33:2635.07.0-16.09167.34VANUATU ISLANDS
2016-04-16 23:58:3719.27.80.37-79.94NEAR COAST OF ECUADOR
2016-04-15 16:25:0610.07.032.78130.73KYUSHU, JAPAN
2016-04-14 21:50:2610.06.5-14.55166.41VANUATU ISLANDS
2016-04-13 13:55:17134.86.923.1394.90MYANMAR-INDIA BORDER REGION
2016-04-10 10:28:58210.46.636.4971.16AFGHANISTAN-TAJIKISTAN BORD REG.
2016-04-07 03:32:5532.86.9-14.01166.55VANUATU ISLANDS
2016-04-06 06:58:5033.76.9-14.11166.57VANUATU ISLANDS
2016-04-03 08:23:5335.07.2-14.35166.82VANUATU ISLANDS
2016-03-20 22:50:2029.66.654.37162.77NEAR EAST COAST OF KAMCHATKA
2016-03-02 12:49:4824.07.9-4.9194.28SOUTHWEST OF SUMATERA, INDONESIA
2016-02-12 10:02:2430.56.5-9.59119.40SUMBA REGION, INDONESIA
2016-01-30 03:25:10161.07.054.01158.51KAMCHATKA
2016-01-24 10:30:30127.87.159.66-153.45SOUTHERN ALASKA
2016-01-21 18:06:5910.06.618.84-106.95OFF COAST OF JALISCO, MEXICO
2016-01-14 03:25:3451.46.741.95142.72HOKKAIDO, JAPAN REGION
2016-01-03 23:05:2255.06.824.8393.66MYANMAR-INDIA BORDER REGION
2015-12-09 10:21:5033.96.9-4.12129.48BANDA SEA
2015-12-07 07:50:0728.77.238.2672.72TAJIKISTAN
2015-12-04 22:24:5410.07.1-47.7485.18SOUTHEAST INDIAN RIDGE
2015-11-24 22:50:53594.87.6-10.10-71.08PERU-BRAZIL BORDER REGION
2015-11-24 22:45:38602.37.5-10.58-70.97PERU-BRAZIL BORDER REGION
2015-11-18 18:31:0410.86.8-8.95158.42SOLOMON ISLANDS
2015-11-17 07:10:0811.16.538.7520.55GREECE
2015-11-13 20:51:3210.06.531.06128.82NORTHWEST OF RYUKYU ISLANDS
2015-11-11 02:46:1910.06.8-29.44-72.17OFF COAST OF CENTRAL CHILE
2015-11-11 01:54:3710.06.9-29.44-72.11OFF COAST OF CENTRAL CHILE
2015-11-07 07:31:4236.36.8-30.91-71.54NEAR COAST OF CENTRAL CHILE
2015-10-26 09:09:32212.57.536.4470.72HINDU KUSH REGION, AFGHANISTAN
2015-10-20 21:52:02127.17.3-14.84167.31VANUATU ISLANDS
2015-09-24 15:53:2824.16.6-0.63131.25IRIAN JAYA REGION, INDONESIA
2015-09-21 17:39:5824.76.5-31.74-71.64NEAR COAST OF CENTRAL CHILE
2015-09-16 22:54:3225.08.3-31.56-71.74NEAR COAST OF CENTRAL CHILE
2015-09-13 08:14:1210.06.625.16-109.38GULF OF CALIFORNIA
2015-08-15 07:47:066.46.6-10.90163.88SOLOMON ISLANDS
2015-08-10 04:12:1410.06.9-9.38158.00SOLOMON ISLANDS
2015-07-27 21:41:2252.97.0-2.69138.48IRIAN JAYA, INDONESIA
2015-07-27 04:49:4411.96.952.38-169.66FOX ISLANDS, ALEUTIAN ISLANDS
2015-07-18 02:27:3310.07.5-10.41165.21SANTA CRUZ ISLANDS
2015-07-10 04:12:4110.06.5-9.32158.45SOLOMON ISLANDS
2015-06-21 21:28:16563.46.5-20.45-178.35FIJI ISLANDS REGION
2015-05-30 11:23:02677.67.827.83140.49BONIN ISLANDS REGION
2015-05-29 07:00:0861.77.056.69-156.53ALASKA PENINSULA
2015-05-22 23:59:3310.06.8-11.16163.19SOLOMON ISLANDS
2015-05-22 21:45:188.06.8-11.09163.68SOLOMON ISLANDS
2015-05-20 22:48:5419.96.9-10.88164.15SANTA CRUZ ISLANDS REGION
2015-05-19 15:25:2112.16.5-54.30-132.11PACIFIC-ANTARCTIC RIDGE
2015-05-12 21:12:5838.96.838.90142.03NEAR EAST COAST OF HONSHU, JAPAN
2015-05-12 07:05:1915.07.427.8486.08NEPAL
2015-05-07 07:10:2222.17.2-7.28154.53SOLOMON ISLANDS
2015-05-05 01:44:0763.17.4-5.50151.92NEW BRITAIN REGION, P.N.G.
2015-05-01 08:06:0457.07.1-5.20151.80NEW BRITAIN REGION, P.N.G.
2015-04-30 10:45:0660.16.8-5.46151.82NEW BRITAIN REGION, P.N.G.
2015-04-26 07:09:0810.06.727.7985.97NEPAL
2015-04-25 06:11:2615.07.928.1384.65NEPAL
2015-04-20 12:00:0138.76.524.05122.51TAIWAN REGION
2015-04-20 01:42:5828.96.624.13122.33TAIWAN REGION
2015-04-17 15:52:5110.06.5-15.91-178.58FIJI ISLANDS REGION
2015-03-30 08:48:2510.06.8-15.55-172.92SAMOA ISLANDS REGION
2015-03-30 08:18:0010.06.8-15.41-172.91SAMOA ISLANDS REGION
2015-03-29 23:48:3465.77.7-4.75152.56NEW BRITAIN REGION, P.N.G.
ppPage: 1 of 8pp