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The LArge-n Seismic Survey in Oklahoma (LASSO) Experiment

Dougherty, Sara L. and Cochran, Elizabeth S. and Harrington, Rebecca M. (2019) The LArge-n Seismic Survey in Oklahoma (LASSO) Experiment. Seismological Research Letters, 90 (5). pp. 2051-2057. ISSN 0895-0695. doi:10.1785/0220190094.

[img] Archive (ZIP) (Figure illustrating the epicentral locations of earthquakes within the study area, which occurred prior to the LArge‐nn Seismic Survey in Oklahoma (LASSO) experiment, and animation of the propagation of the seismic wavefield across the array) - Supplemental Material
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In 2016, the U.S. Geological Survey deployed >1800 vertical-component nodal seismometers in Grant County, Oklahoma, to study induced seismic activity associated with production of the Mississippi limestone play. The LArge‐n Seismic Survey in Oklahoma (LASSO) array operated for approximately one month, covering a 25 km by 32 km region with a nominal station spacing of ∼400  m⁠. Primary goals of the deployment were to detect microseismic events not captured by the sparser regional network stations and to provide nearly unaliased records of the seismic wavefield. A more complete record of earthquakes allows us to map the spatiotemporal evolution of induced event sequences and illuminates the structures on which the events occur. Dense records of the seismic wavefield also provide improved measurements of the earthquake source, including focal mechanisms and stress drops. Taken together, we can use these findings to glean insights into the processes that induce earthquakes. Here, we describe the array layout, features of the nodal sensors, data recording configurations, and the field deployment. We also provide examples of earthquake waveforms recorded by the array to illustrate data quality and initial observations. LASSO array data provide a significant resource for understanding the occurrence of earthquakes induced by wastewater disposal.

Item Type:Article
Related URLs:
URLURL TypeDescription
Dougherty, Sara L.0000-0002-5327-3286
Cochran, Elizabeth S.0000-0003-2485-4484
Harrington, Rebecca M.0000-0002-3538-8020
Additional Information:© 2019 Seismological Society of America. Published Online 7 August 2019. Data and Resources: Data collected by the LArge‐n Seismic Survey in Oklahoma (LASSO) experiment described and presented here have been archived at the Incorporated Research Institutions for Seismology (IRIS) Data Management Center under network code 2A in PH5 format and can be accessed at (last accessed July 2019). The doi for the LASSO dataset is 10.7914/SN/2A_2016 (Dougherty et al., 2016).Earthquake catalog data from the Oklahoma Geological Survey (, last accessed December 2018) and the Advanced National Seismic System Comprehensive Earthquake Catalog (ANSS ComCat;, last accessed May 2018), and wastewater injection well data from the Oklahoma Corporation Commission (, last accessed March 2017) were used in this report. Some figures were generated using the Generic Mapping Tools v.5.2.1 (, last accessed July 2019; Wessel et al., 2013). The authors thank J. Ashburn, N. Campbell, X. Chen, F. Clerc, P. Cox, C. Criley, K. Galvin, N. Ghouse, J. Goussi, J. Guzman, D. Hollis, S. Li, B. McKevitt, J. Morris, A. Peña Castro, J. Pfau, A. Thiel, N. van der Elst, E. Vuittonet, M. Weingarten, and I. Woelfel for their work installing and/or retrieving the LArge‐n Seismic Survey in Oklahoma (LASSO) array. The authors are grateful to the Grant County Board of Commissioners for allowing us to deploy the LASSO array on public land. The authors also thank B. Brooks, J. Steidl, and three anonymous reviewers for helpful comments, which improved the article. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Group:Seismological Laboratory
Issue or Number:5
Record Number:CaltechAUTHORS:20190807-083906187
Persistent URL:
Official Citation:Sara L. Dougherty, Elizabeth S. Cochran, Rebecca M. Harrington; The LArge‐n Seismic Survey in Oklahoma (LASSO) Experiment. Seismological Research Letters ; 90 (5): 2051–2057. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97692
Deposited By: Tony Diaz
Deposited On:07 Aug 2019 16:12
Last Modified:16 Nov 2021 17:33

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