https://doi.org/10.82144/0bed112d https://seamap.env.duke.edu/dataset/1112 https://www.gbif.org/dataset/6fd6b17a-5941-4a45-be83-6d7855801b65 https://obis.org/dataset/27f259f7-db48-48fe-8003-832804fcf365 Troy Nelson TGS-NOPEC Geophysical Company Primary contact Tnelson@arcis.com Megan Blees ASRC Energy Services, Inc. Secondary contact Megan.Blees@asrcenergy.com OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu OBIS-SEAMAP Marine Geospatial Ecology Lab, Duke University

A328 LSRC building Durham NC 27708 US

seamap-contact@duke.edu https://seamap.env.duke.edu distributor Troy Nelson TGS-NOPEC Geophysical Company Primary contact Tnelson@arcis.com owner Megan Blees ASRC Energy Services, Inc. Secondary contact Megan.Blees@asrcenergy.com originator 2025-07-31 eng Original provider: TGS Dataset credits: ASRC Energy Services, Inc. TGS-NOPEC Geophysical Company RPS Abstract: TGS-NOPEC Geophysical Company (TGS) conducted a 2D marine seismic survey along predetermined lines in U.S. Federal and international waters of the Chukchi Sea during the open-water season from 25 August to 30 October 2013. Two vessels were involved including 1) a seismic vessel (Geo Arctic) towing a 3,280 cu.in. seismic array and 8,100 m long solid streamer cable and 2) a marine mammal monitoring vessel (Norseman) which operated in advance of the seismic vessel. Both vessels had teams of visual protected species observers (PSOs) trained to monitor and implement seismic mitigation according to regulatory permits from U.S. Agencies. Twenty-six detections were made over 1195.5 hours of acoustic monitoring. In addition to acoustic monitoring, the monitoring vessel also employed visual protected species observers (PSOs). This data set includes acoustic detection data and visual sighting data is presented separately. Marine Biology Passive acoustic detection Marine Animal Survey Marine mammals Acoustic - group size Vessel N/A In numeric fields, original data may contain 'X' which was replaced with Null. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License. https://seamap.env.duke.edu/dataset/1112 Oceans,North Pacific Ocean,Arctic Ocean,Chukchi Sea -168.75543 -157.53055 74.2677 70.70163 2012-10-24 2013-10-27 Scientific names are based on the Integrated Taxonomic Information System (ITIS). species Balaena mysticetus Bowhead order Cetacea Cetaceans species Delphinapterus leucas Beluga family Delphinidae Dolphins suborder Mysticeti Baleen whales species Odobenus rosmarus Walrus N/A notPlanned Troy Nelson TGS-NOPEC Geophysical Company Primary contact Tnelson@arcis.com NA NA NA Troy Nelson owner Megan Blees originator NA zd_1112 2025-07-31T16:31:00-04:00 dataset Nelson, T. and M. Blees. 2014. TGS Seismic Survey Acoustic Detections in Chukchi Sea 2013. Version 1.0.0. Dataset published in OBIS-SEAMAP. https://doi.org/10.82144/0bed112d. OBIS-SEAMAP Dataset Page UTF-8 Interactive map https://seamap.env.duke.edu/dataset/1112 FGDC Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1112/fgdc EML Metadata UTF-8 XML https://seamap.env.duke.edu/dataset/1112/eml OBIS-SEAMAP zd_1112 zd_1112 Cate, J.R., M. Smultea, M. Blees, M. Larson, S. Simpson, T. Jefferson and D. Steckler. 2014. 90-Day Report of Marine Mammal Monitoring and Mitigation during a 2D Seismic Survey by TGS in the Chukchi Sea, August through October 2013. AES Doc. No. 15416-04 13-185. Prepared by ASRC Energy Services, Smultea Environmental Sciences, Clymene Enterprises and Entiat River Technologies for TGS-NOPEC Geophysical Company, National Marine Fisheries Service and U.S> Fish and Wildlife Service: 122 p. + Appendices.