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 Exotic Seismic Event Products

The exotic seismic sources are non-earthquake seismic sources such as landslide, debris flows, dam collapses, floods, and avalanches that generate seismic signals but are rarely included in common earthquake catalogs. The seismic signals associated with such events contain valuable information about the source time function, energy, and sequence of events that is often not available from other sources.

The event detail page of the Exotic Seismic Events Catalog (ESEC) data product provides access to source parameter data such as location, and time of the event along with a selection of source-specific parameters for non-earthquake seismic sources that could help to accelerate research in the area of environmental seismology, which to date has been dominated by only event-specific studies.

For more information visit the ESEC product page

Citing Exotic Seismic Event Products

If you use Exotic Seismic Event products in publications, please cite according to the instructions at:

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

Esec Help

This page displays information for individual Exotic Seismic events.
Nuugaatsiaq, Greenland - landslide icon
Event
Event ID: 4 Event ID
Name: Nuugaatsiaq, Greenland Name given to each event entry based on location characteristics. Related events are further distinguished by order of occurrence. i.e. (Oso main, Oso secondary, West Salt Creek precursory, South Twin 1, South Twin 2, South Twin 3)
Type: landslide Landslide type using name in published peer-reviewed journal or when no published type is available, following the Hungr et al. (2014) classification approach, which is a modification of Varnes (1978) based on available information about the event. The generic term “landslide” is used when insufficient information is available to classify.
Start Date:  2017-06-17 23:39:12 Approximate time of first observable arrivals on closest seismic stations, in UTC. Actual start time of surface movement is earlier by an unknown amount in most cases due to emergent onsets and wave travel times. The start time is taken as the earliest point where the signal emerges from the background noise on the closest three stations that have duration picks in the high frequency band rounded down to the nearest second. i.e. (2005-05-15 17:11:40).
End Date:  2017-06-17 23:49:06 Approximate end time, in UTC, of seismic signal generated by the surface movement. Chosen as the latest point where the signal disappears back into the background noise on the closest three stations for which there are duration picks in the high frequency band, rounded up to the nearest second i.e. (2005-05-15 17:16:56)
Latitude: 71.6438 Latitude of the source area of the event, same as Crown_lat if it exists, otherwise equal to the best estimate with an associated uncertainty (LocUncert_km)
Longitude: -52.3288 Longitude of the source area of the event, same as Crown_lon if it exists, otherwise equal to the best estimate with an associated uncertainty (LocUncert_km)
Location uncertainty: 0.00 Estimate of the location uncertainty (km) in latitude and longitude values (for events without imagery)
Source(s):
Allstadt, Kate E., McVey, Brennah G., and Malone, Stephen D., 2017, Seismogenic Landslides, Debris Flows, and Outburst Floods in the Western United States and Canada from 1977 to 2017: U.S. Geological Survey data release, https://doi.org/10.5066/F7251H3W.
https://doi.org/10.5066/F7251H3W
Source of event entry
Number of Stations:
167 Download Station List
List of stations within a semi-arbitrary radius of about 500 km (less for smaller events)
Event details
Area total (m2): Best estimate of the total area of surface expression (source and deposition) in m2. Values from published sources or estimated from satellite imagery.
Area source (m2): Best estimate of area of source region (m2). Values from published sources or estimated from satellite imagery.
Area source low (m2): Lower bound estimate for area of source region (m2). Values from published sources or estimated from satellite imagery.
Area source high (m2): Upper bound estimate for area of source region (m2). Values from published sources or estimated from satellite imagery.
Volume (m3): 43,000,000 Best estimate of volume of material moved during surface event (m3). Values from published sources or estimated from Area_source as described in Event Information notes for this event.
Volume low (m3): 33,400,000 Lower bound estimate for volume of material moved during surface event (m3). Values from published sources or estimated from Area_source and assuming Area_source_low and Area_source_high correspond to one standard deviation as described in Event Information notes for this event.
Volume high (m3): 51,000,000 Upper bound estimate for volume of material moved during surface event (m3). Values from published sources or estimated from Area_source and assuming Area_source_low and Area_source_high correspond to one standard deviation as described in Event Information notes for this event.
Mass (kg): Mass of material moved during surface failure (kg). Only reported when there are published values even when volumes are available due to uncertainties in material density, especially for events involving significant amounts of ice and/or water.
Mass low (kg): Lower bound estimate of mass moved during surface failure (kg). Only reported when there are published values.
Mass high (kg): Upper bound estimate of mass moved during surface failure (kg). Only reported when there are published values.
H (m): Height of each landslide measured from crown to tip of the toe (m). Values are from published sources or estimated by subtracting toe tip elevation from crown elevation.
H low (m): 900 Lower bound estimate for height (m). Values from published sources or estimated based on uncertainty in crown and toe tip elevation.
H high (m): Upper bound estimate for height (m). Values from published sources or estimated based on uncertainty in crown and toe tip elevation.
L (m): 1,900 Total length of centerline of each failure from crown to tip of the toe (m). Values from published sources or estimated by measuring the centerline of each event with available imagery.
L low (m): Lower bound estimate for total length (m). Values from published sources or estimated based on uncertainty in centerline length.
L high (m): Upper bound estimate for total length (m). Values from published sources or estimated based on uncertainty in centerline length.
H fall (m): For events with vertical free-fall components, the vertical free-fall drop height (m)
H fall low (m): Lowest estimate for free-fall drop height (m)
H fall high (m): Highest estimate for free-fall drop height (m)
Upstream drain area (km2): Best estimate of drainage area above location where event was observed in square kilometers. Most appropriate for debris flow and flood events.
Peak discharge (m3/s): Best estimate of peak discharge passing area where event was observed in cubic meters per second. Most appropriate for debris flow and flood type events.
Peak discharge low (m3/s): Lower bound estimate of peak discharge passing area where event was observed in cubic meters per second. Most appropriate for debris flow and flood type events.
Peak discharge high (m3/s): Upper bound estimate of peak discharge passing area where event was observed in cubic meters per second. Most appropriate for debris flow and flood type events.
Peak flow height (m): Best estimate of peak flow height passing area where event was observed, in meters. Most appropriate for debris flow and flood-type events.
Peak flow height low (m): Lower bound estimate of peak flow height passing area where event was observed, in meters. Most appropriate for debris flow and flood-type events.
Peak flow height high (m): Upper bound estimate of peak flow height passing area where event was observed, in meters. Most appropriate for debris flow and flood-type events.
Max dist vhf (km): Maximum distance that the very high frequency seismic signal (>15 Hz) was detected above the noise level on available seismic station data. Distance should be measured from latitude and longitude fields, which should correspond, in most cases, to crown location.
Max dist vhf reached?: Null True if the farthest distance that the very high frequency seismic signal (>15 Hz) was detected above the noise level on available seismic data was reached, False if the signal is likely visible farther than maxdistVHF_km, but was not examined, Null if not applicable (e.g. no VHF signal detected).
Max dist hf (km): 1,100 Maximum distance (km) that the high frequency seismic signal (1-5 Hz) was detected above the noise level on available seismic station data. Distance measured from latitude and longitude fields, which correspond in most cases to crown location.
Max dist hf reached?: False True if the farthest distance that the high frequency seismic signal (1-5 Hz) was detected above the noise level on available seismic data was reached, False if the signal is likely visible farther than maxdistHFkm, but was not examined, Null if not applicable (e.g. no HF signal detected).
Max dist ip (km): Maximum distance, in km, that the intermediate-period seismic signal (~1-10 sec) was detected above the noise level on available seismic data. Distance should be measured from latitude and longitude fields, which should correspond in most cases to crown location.
Max dist ip reached?: Null True if the farthest distance that the intermediate-period seismic signal (~1-10 sec) was detected above the noise level on available seismic records was reached, False if the signal is likely visible farther than maxdistLP_km, but was not examined, Null if not applicable (e.g. no LP signal detected).
Max dist lp (km): 1,100 Maximum distance (km), that the long period seismic signal (>20 sec) was detected above the noise level on available seismic data. Distance measured from latitude and longitude fields, which correspond in most cases to crown location.
Max dist lp reached?: False True if the farthest distance that the long period seismic signal (>20 sec) was detected above the noise level on available seismic data was reached, False if the signal is likely visible farther than maxdistLPkm, but was not examined, Null if not applicable (e.g. no LP signal detected).
Max dist infra (km): Maximum distance that the infrasound signal (0.5-2 Hz) was detected above the noise level on available infrasound station data. Distance measured from latitude and longitude fields, which correspond in most cases to crown location.
Max dist infra reached?: Null True (1) if the farthest distance that the infrasound signal (0.5-2 Hz) was detected above the noise level on available infrasonic records was reached, False (0) if the signal is likely visible farther than maxdistINFRA_km, but was not examined, Null if not applicable (e.g. no infrasound signal detected).
Infrasound detected?: Null False (0) = no infrasound (0.5-2 Hz) signal observed, True (1) = clear infrasound signal observed, Null if no available FDSN infrasound stations within 200 km of event location.
Other data quality 1-5: 4
Relative quality of ancillary data about event (imagery, media reports, publications etc.),
each successive ranking is inclusive of the criteria before it:
1 = seismic detection but no visual documentation; 2 = photographic documentation;
3 = media reports, non-peer reviewed scientific reports, and/or inclusion in broad peer-reviewed
scientific study; 4 = satellite imagery available; 5 = detailed peer-reviewed scientific study
Crown lat: 71.6438 Latitude of the most upslope point of each surface expression (crown)
Crown lon: -52.3288 Longitude of the most upslope point of each surface expression (crown)
Tip lat: Latitude of the most distal point of toe (tip) of each surface expression
Tip lon: Longitude of the most distal point of toe (tip) of each surface expression
Lp potential: 1
0: no long period (LP, period >20 s) waves observed,
1: clear LP waves observed,
2: weak or questionable LP waves observed
Data location: IRIS Location of seismic data (e.g. IRIS, NCEDC, filename(s))
Event-station location map
Stations:    Not reviewed    No detect    < 1 Hz    > 1 Hz    BB  
Event Origin: 
Infra:    Not reviewed    No detect    Detected  
Event Information Sources: 5 items found
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InformationReferencePhotoGis
The USGS assigned this event a surface wave magnitude of 4.2 and labeled it as a landslide. The location was based on satellite imagery, not seismically determined.USGS (2017)
IRIS (2017) created a special events page for this event that the community contributed to. Several videos and summaries are linked on this page, as well as other observations from the community, notably an observation by Jackie Caplan-Auerbach that the event was preceded by repeating earthquakes that became more and more frequent approaching the landslide time.IRIS (2017)
The later part of the long period signal is dominated by the seismic signal generated by the loading of the earth surface due to the tsunami according to Bessette-Kirton and others (2017).Bessette-Kirton and others (2017)
Photos of this event are included in the Landslide Blog postPetley (2017)
Volume range and location taken from the results of Bessette-Kirton and others (2017), who estimated 35-51 million cubic meters based on DEM differencing. The midpoint of that range was taken as the best estimate (43 million cubic meters), but the authors state that the 35-50 million cubic meter range is a minimum estimate because of unknown subsurface geometry below the depositional area. Only low H and L estimates are reported because this event entered a fjord.Bessette-Kirton and others (2017)
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Attachments
FilenameDescriptionFile Type
4_DB.csvDatabase tables for event 4application/octet-stream