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: 643 items found
ppPage: 1 of 7pp
Event Time (UTC)Depth (km)Trigger MagLatitudeLongitudeRegion
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.
2015-03-17 22:12:2841.76.61.66126.52NORTHERN MOLUCCA SEA
2015-02-27 13:45:05547.07.0-7.28122.53FLORES SEA
2015-02-19 13:18:3210.06.5-16.40168.09VANUATU ISLANDS
2015-02-16 23:06:2610.06.839.85142.81NEAR EAST COAST OF HONSHU, JAPAN
2015-02-16 22:00:5310.06.7-55.52-28.25SOUTH SANDWICH ISLANDS REGION
2015-02-13 18:59:1110.06.952.59-31.92NORTHERN MID-ATLANTIC RIDGE
2015-02-11 18:57:18190.86.7-23.12-66.60JUJUY PROVINCE, ARGENTINA
2015-01-23 03:47:27218.56.8-17.00168.53VANUATU ISLANDS
2014-12-21 11:34:1454.76.62.13126.65NORTHERN MOLUCCA SEA
2014-12-08 08:54:5210.06.77.97-82.69SOUTH OF PANAMA
2014-12-07 01:22:0010.06.8-6.54154.45SOLOMON ISLANDS
2014-11-26 14:33:4341.16.81.98126.55NORTHERN MOLUCCA SEA
2014-11-21 10:10:2048.26.92.23127.08NORTHERN MOLUCCA SEA
2014-11-16 22:33:2135.06.7-37.84179.76OFF E. COAST OF N. ISLAND, N.Z.
2014-11-15 02:31:4247.07.31.89126.51NORTHERN MOLUCCA SEA
2014-11-01 18:57:22421.96.9-19.69-177.80FIJI ISLANDS REGION
2014-10-14 03:51:3540.07.412.58-88.05OFF COAST OF CENTRAL AMERICA
2014-09-17 06:14:46133.97.113.74144.39MARIANA ISLANDS
2014-09-10 02:46:0620.56.5-0.14125.09SOUTHERN MOLUCCA SEA
2014-08-24 23:21:45101.07.0-14.59-73.58CENTRAL PERU
2014-08-23 22:32:2332.06.6-32.70-71.39NEAR COAST OF CENTRAL CHILE
2014-08-03 00:22:0313.36.60.85146.12E. CAROLINE ISLANDS, MICRONESIA
2014-07-21 14:54:40616.16.9-19.78-178.44FIJI ISLANDS REGION
2014-07-20 18:32:4760.86.644.63148.73KURIL ISLANDS
2014-07-11 19:22:0013.36.837.07142.36OFF EAST COAST OF HONSHU, JAPAN
2014-07-07 11:23:5892.27.114.78-92.37NEAR COAST OF CHIAPAS, MEXICO
2014-07-04 15:00:2610.06.6-6.20152.82NEW BRITAIN REGION, P.N.G.
2014-06-29 07:52:5714.77.1-55.56-28.57SOUTH SANDWICH ISLANDS REGION
2014-06-24 03:15:4135.06.652.31176.69RAT ISLANDS, ALEUTIAN ISLANDS
2014-06-23 20:53:10114.48.051.80178.76RAT ISLANDS, ALEUTIAN ISLANDS
2014-06-23 19:19:1620.07.2-30.12-177.67KERMADEC ISLANDS, NEW ZEALAND
2014-05-24 09:25:0310.06.940.3025.45AEGEAN SEA
2014-05-15 08:16:3410.06.66.51144.90E. CAROLINE ISLANDS, MICRONESIA
2014-05-13 06:35:2410.06.87.25-82.33SOUTH OF PANAMA
2014-05-04 09:15:53527.66.6-24.64179.08SOUTH OF FIJI ISLANDS
2014-05-01 06:36:37117.56.7-21.51170.22LOYALTY ISLANDS REGION
2014-04-26 06:02:1610.06.5-20.72-174.67TONGA ISLANDS
2014-04-24 03:10:1311.46.749.85-127.42VANCOUVER ISLAND REGION
2014-04-19 13:27:5930.97.5-6.72154.93SOLOMON ISLANDS
2014-04-19 01:04:0645.56.9-6.70155.07SOLOMON ISLANDS
2014-04-18 14:27:2948.67.517.59-100.74GUERRERO, MEXICO
2014-04-15 03:57:0211.76.9-53.538.70BOUVET ISLAND REGION
2014-04-13 12:36:1835.07.5-11.45162.06SOLOMON ISLANDS
2014-04-12 20:14:3929.37.6-11.31162.21SOLOMON ISLANDS
2014-04-11 20:29:15138.66.611.71-85.96NICARAGUA
2014-04-11 08:16:4950.66.7-6.83154.97SOLOMON ISLANDS
2014-04-11 07:07:2250.67.3-6.65155.04SOLOMON ISLANDS
2014-04-03 02:43:1520.07.8-20.43-70.11NEAR COAST OF NORTHERN CHILE
2014-04-01 23:46:4510.08.0-19.63-70.86NEAR COAST OF NORTHERN CHILE
2014-03-26 03:29:35475.16.5-26.10179.29SOUTH OF FIJI ISLANDS
2014-03-21 13:41:0710.06.57.7794.32NICOBAR ISLANDS, INDIA
2014-03-16 21:16:3335.07.0-19.84-70.57NEAR COAST OF NORTHERN CHILE
2014-03-10 05:18:127.06.940.82-125.13OFF COAST OF NORTHERN CALIFORNIA
2014-03-02 20:11:22112.36.727.42127.36RYUKYU ISLANDS
2014-02-18 09:27:1417.46.714.69-59.01WINDWARD ISLANDS
2014-02-12 09:19:4912.46.835.9282.56XIZANG
2014-02-07 08:40:12111.26.5-15.06167.30VANUATU ISLANDS
2014-02-02 09:26:3519.46.6-32.90-177.82SOUTH OF KERMADEC ISLANDS
2014-01-13 04:01:0428.56.519.00-66.83PUERTO RICO REGION
ppPage: 1 of 7pp