The Cascadia Tsunami Deposit Database contains data on the location and sedimentological properties of tsunami deposits found along the Cascadia margin. Data have been compiled from 52 studies, documenting 59 sites from northern California to Vancouver Island, British Columbia that contain known or potential tsunami deposits. Bibliographical references are provided for all sites included in the database. Cascadia tsunami deposits are usually seen as anomalous sand layers in coastal marsh or lake sediments. The studies cited in the database use numerous criteria based on sedimentary characteristics to distinguish tsunami deposits from sand layers deposited by other processes, such as river flooding and storm surges. Several studies cited in the database contain evidence for more than one tsunami at a site. Data categories include age, thickness, layering, grainsize, and other sedimentological characteristics of Cascadia tsunami deposits. The database documents the variability observed in tsunami deposits found along the Cascadia margin.

Chirp sub-bottom data were collected by the U.S. Geological Survey in collaboration with the University of Washington (UW) in the summer of 2019 along the Cascadia submarine forearc offshore Oregon and Washington.

This data set was acquired with a Sea-Bird SBE-9 CTD during Atlantis expedition AT26-04 conducted in 2013 (Chief Scientist: Dr. H. Paul Johnson; Investigator(s): Dr. H. Paul Johnson and Dr. Evan Solomon). These data files are of Sea-Bird CTD format and include Fluorescence, Pressure, Conductivity, and Temperature data and were processed after data collection. Data were acquired as part of the project(s): Thermal Structure of the Cascadia Subduction Zone on the Washington Margin and Thermal Structure of the Cascadia Subduction Zone, Grays Canyon Discovery Corridor, Washington, and funding was provided by NSF grant(s): OCE11-44164 and OCE12-49552. This data was cited by Johnson et al., 2013.

Abstract: This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Marcus G. Langseth expedition MGL1212 conducted in 2012 (Chief Scientist: Dr. W. Steven Holbrook). These data files are of ASCII format and include Seismic Shot Point Navigation data (shot logs). Data were acquired as part of the projects: RAPID: Collaborative Research: A Short, Open-Access 2D MCS Acquisition Program off Washington State and COAST - Cascadia Open-Access Seismic Transects, and funding was provided by NSF grants: N000141010175, OCE11-47762, OCE11-47841, OCE11-49095, OCE11-50628, and OCE11-53563.

This earthquake catalog spans 26 July 2011 through 1 September 2015 and corresponds to the Geology article of Morton et al. (2018; https://doi.org/10.1130/G45354.1). Events were detected using the subspace detection algorithm of Maciera et al. (2010) and located by utilizing direct P and S phase arrival time picks with the hypoinverse location program (Klein et al., 2002). Events that were previously reported in regional earthquake catalogs and the studies of Tréhu et al. (2015; 2018) and Stone et al. (2018) are indicated, as well as the events that were used as templates for subspace scanning. The catalog includes hypocentral locations, origin time, duration magnitudes, number of seismic picks used in location determination, azimuthal gap, event-to-station distance, and location and timing uncertainties. The catalog is separated into three groupings (three ASCII files separated from the one spreadsheet): Earthquakes within a cluster associated with a subducted seamount (150 events), earthquakes within a cluster to the north of the seamount (73 events), and earthquakes not within the clusters (87 events). The data set was generated as part of the project called Developing Methods for Detection and Analysis of Repeating Earthquakes and Low Frequency Earthquakes Using Cascadia Initiative Amphibious Network Data. Funding was provided by NSF grant OCE14-34550, awarded to S.L. Bilek.

This data set was acquired with a Sippican Deep Blue XBT Expendable Probe during Thomas G. Thompson expedition TN265 conducted in 2011 (Chief Scientist: Dr. Christopher Romsos). These data files are of Sippican MK21 Export Data File format and include Sound Velocity and Temperature data that have not been processed. Data were acquired as part of the project(s): NSF Cascadia Initiative Bathymetric Survey for OBS Deployment, and funding was provided by NSF grant(s): OCE11-37986.

This data set was acquired with the LDEO Multi-Channel Seismic system during Marcus G. Langseth expedition MGL1211 conducted in 2012 (Chief Scientist: Dr. Suzanne Carbotte). These data files are of UKOOA P1/90 format and include Seismic Navigation data and were processed after data collection. Data were acquired as part of the projects: Collaborative Research: Imaging the Cascadia Subduction Zone: A Ship-to-shore Opportunity and Collaborative Research: Evolution and hydration of the Juan de Fuca crust and uppermost mantle: A plate-scale seismic investigation from ridge to trench, and funding was provided by NSF grants: OCE10-29305, OCE10-29411, EAR11-47622, and EAR11-47975.

This dataset includes computed tomography (CT) scan imagery of sediment cores collected in southern Cascadia (offshore northern California) aboard the M/V Bold Horizon in September-October 2019.

Processed heat flow data acquired using the thermal blanket device deployed by ROV Jason II during the 2013 Atlantis expedition AT26-04 at the Cascadia Subduction Zone. The data file is in ASCII format and was generated as a part of the projects called 'Thermal Structure of the Cascadia Subduction Zone on the Washington Margin' and 'Thermal Structure of the Cascadia Subduction Zone, Grays Canyon Discovery Corridor, Washington'. Funding was provided by NSF grants OCE11-44164 and OCE12-49552 (Investigators: H. Paul Johnson, Evan Solomon, Robert Harris). Data was cited by Johnson et al., 2013 and Johnson et al., 2014.

Final Report FE0013998 - The project goal is to investigate the response of the Washington margin gas hydrate system to the contemporary warming of bottom water along the upper continental slope.

Rupture models for full margin Cascadia earthquakes. Companion data set tot he paper "Deep Coseismic Slip in the Cascadia Megathrust can be Consistent with Coastal Subsidence " ublished in Geophysical Research Letters.

This updated version also includes the static offsets at the coastline for each rupture.

Data document related to the processed heat flow data acquired using the Multi-penetration Heat Flow Probe (MHFP) device at the Cascadia subduction zone during Atlantis cruise AT26-04. The document describes the heat flow probe instrumentation, methodology, and data. The data file is in PDF format and was generated as part of the project called Thermal Structure of the Cascadia Subduction Zone, Grays Canyon Discovery Corridor, Washington. Funding was provided by NSF grant OCE12-49552 (investigator Robert Harris).

The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from H. J. Andrews Experimental Forest (AND) contains air temperature (mean) measurements in celsius units and were aggregated to a monthly timescale.

This data set was acquired with a Sippican XCTD-1 XCTD Expendable Probe during Marcus G. Langseth expedition MGL1212 conducted in 2012 (Chief Scientist: Dr. W. Steven Holbrook). These data files are of Sippican MK21 Export Data File format and include Sound Velocity, Salinity, Temperature, and Conductivity data that have not been processed. Data were acquired as part of the project(s): RAPID: Collaborative Research: A Short, Open-Access 2D MCS Acquisition Program off Washington State and COAST - Cascadia Open-Access Seismic Transects, and funding was provided by NSF grant(s): N000141010175, OCE11-47762, OCE11-47841, OCE11-49095, OCE11-50628, and OCE11-53563.

The USGS Powell Center Cascadia earthquake hazards working group compiled published onshore and offshore paleoseismic data along the Cascadia subduction zone, spanning sites from Vancouver Island to the Mendocino triple junction. Evidence for megathrust rupture includes coastal land-level change, tsunami inundation, onshore shaking proxies such as landslides or liquefaction, and offshore shaking proxies such as marine turbidites. The quality of paleoseismic data for megathrust rupture along the Cascadia subduction zone collected over the past three decades varies because analytical capabilities and data collection methodologies have evolved. Thus, as part of the compilation, we also present a ranking scheme to assess the quality of age estimates and evidence for great megathrust rupture. With the age ranking scheme, we ask: "How well is a proposed paleoseismic event dated?" based on the materials and methods used. With the evidence ranking scheme, we ask: "How confident are we tha ...

This data release contains supplemental data for the following paper: Nelson, A.R., DuRoss, C.B., Mahan, S.A., Gray, H.J., Engelhart, S.E., Witter, R.C., Hawkes, A.D., Horton, B.P., Kelsey, H.M., and Padgett, J.S., 2021, A maximum rupture model for the central and southern Cascadia subduction zone—assessing ages for coastal evidence of megathrust earthquakes and tsunamis: Quaternary Science Reviews 261, https://doi.org/10.1016/j.quascirev.2021.106922. The data include a compilation of new and previously published radiocarbon ages from the original cores from Bradley Lake of Kelsey et al. (2005; odt format), and tables of new and previously published radiocarbon data for 7 of the 13 tidal wetland sites along the coasts of Oregon and northern California, whose ages we compare with the ages from Bradley Lake (odt format). The data files (odt format) also include code for the OxCal (version 4.4; https://c14.arch.ox.ac.uk/oxcal.html) Bayesian software models used with selected radiocarbon ages to calculate age probability density functions for the lake’s earthquake or tsunami-caused disturbance events, and for the stratigraphic contacts produced by earthquakes and tsunamis at 12 of the 13 tidal wetland sites (odt format). An additional text file (odt format) explains the addition of variance to the errors on laboratory reported radiocarbon ages in the tables analyzed prior to 1998, and those analyzed by the National Ocean Sciences AMS Facility (NOSAMS) at the Woods Hole Oceanographic Institution, Woods Hole, Massachusetts. Data describing the results of our recent unsuccessful attempt to use optical dating methods (OSL and IRSL) on quartz grains from tsunami deposits in Bradley Lake to date the deposits can be found in Mahan et al. (2021; U.S. Geological Survey data release, https://doi.org/10.5066/P9YWIDOW).

Abstract: This data set was acquired with Kongsberg Maritime EM302 Multibeam Sonar during R/V Thomas G. Thompson expedition TN311 conducted in 2014 (Chief Scientist: Dr. C. David Chadwell, Investigators: Dr. C. David Chadwell, James Gibson). These data files are of NetCDF Grid format and include Swath Bathymetry data that were processed after acquisition.

This data set was acquired with a Paroscientific Pressure Gauge at CORK 1027C during Atlantis expedition AT26-03 conducted in 2013 (Chief Scientist: Dr. Andrew Fisher; Investigator(s): Dr. Andrew Fisher, Dr. Keir Becker, Dr. Jordan Clark, and Dr. Geoffrey Wheat). These data files are of Text File (ASCII) format and include Pressure time series data that have not been processed. Data were acquired as part of the project(s): Hydrogeologic Experiments on the Eastern Flank of the Juan de Fuca Ridge, and funding was provided by NSF grant(s): OCE10-29774, OCE10-30061, OCE10-30350, OCE10-31352, and OCE10-31808.

Abstract: This data set was acquired with the LDEO Multi-Channel Seismic system during a seismic survey of the Cascadia subduction zone, as part of R/V Marcus G. Langseth cruise MGL2208 (Chief Scientist Glenn Spinelli). The data files are generated from the processed P190 seismic navigation files and are in ASCII format and contain shot log information that includes the shot number and seismic source location. The data set was acquired as part of the project called CHINOoK: Cascadia Hydrothermal circulation IN Ocean (K)rust. Funding was provided by NSF awards OCE20-34896 and OCE20-34872.

This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Maurice Ewing expedition EW9414 conducted in 1994 (Chief Scientist: Dr. Sam Clarke). These data files are of SEGY format and include Multi-Channel Reflection Seismic shot data that have not been processed. Data were acquired as part of the project: Onshore-Offshore Wide-Angle Seismic Recording Near Cape Blanco, Oregon, and funding was provided by grant: USGS-XXX.