TexNet and the Center for Integrated Seismicity Research

Introduction

The TexNet Seismic Observatory and its research arm, the Center for Integrated Seismicity Research (CISR) at The University of Texas at Austin, is a multidisciplinary, trans-college research center managed by the Bureau of Economic Geology (BEG). The overall goals of the TexNet-CISR collaborative are to collect high-quality data on earthquakes in Texas and conduct fundamental and applied research to better understand naturally occurring and potentially induced earthquakes and the associated risks. Our thoroughly integrated research program is studying the subsurface processes that may influence seismicity that will lead to better quantifications of the associated hazards and risks to the citizens and infrastructure of Texas. A primary application of the data and research is to improve standards of practice resulting in the mitigation of seismicity that may stem from industrial activity. The highest priority is fact-based communication with stakeholders and rapid response to public concerns regarding seismicity.

Two thirds of TexNet-CISR funding comes from the State of Texas through the TexNet Seismic Monitoring Project and 1/3 comes from CISR industrial associate partners, currently 14 companies.

Our active research areas include:

  • Seismicity Monitoring and Cataloging
  • Seismological Analysis
  • Subsurface Geological Characterization
  • Fluid Flow and Pore Pressure Modeling
  • Hazard and Risk Assessment
  • Integrated Analyses
  • Information Dissemination

For detailed information on TexNet-CISR’s research projects please select the Research Projects link to the right. Here is a timeline of TexNet-CISR's most significant events and milestones since its 2015 inception.

 

TexNet-CISR Timeline June 2015 - April 2018

Timeline

 

 

TexNet-CISR also manages the Regional Induced Seismicity Collaborative (RISC). The state geologic surveys of Texas, Oklahoma, Kansas, New Mexico, and Arkansas, in cooperation with the U.S. Department of Energy and the Ground Water Protection Council, have formed a collaborative research project to address the issues of induced seismicity in the southern midcontinent. RISC will serve as a collaboration platform to facilitate the sharing of effective practices on seismicity monitoring and research. More information about RISC can be found in the link to the right.

The figure below shows the history of earthquakes in key areas of Texas as cataloged by the USGS. The cumulative graph shows the rate of earthquakes of magnitude of 2.7 and higher. The earthquake data shown should be considered as incomplete prior to the early 2000's when the (pre-TexNet) seismic network became effective at the regional scale.

Earthquake Trends in Key Texas Operational Areas

Earthquake Trends in Key areas

 

TexNet Earthquake Monitoring

The TexNet Earthquake Monitoring network begin cataloging earthquakes in January of 2017. Although the number of earthquakes detected and cataloged per month often exceeds 300, the vast majority of these earthquakes are very small and not felt at the surface. However, TexNet is frequently detecting somewhat larger earthquakes that are felt at the surface which need to be studied. Please follow the links at the right to access the TexNet Earthquake Catalog and to find out more information about the monitoring program. 

Organization

The TexNet-CISR organization is led by Principal Investigators Dr. Peter Hennings, Dr. Ellen Rathje, and Dr. Alexandros Savvaidis. Dr. Savvaidis is the Manager of the TexNet Seismic Observatory and is the PI for seismology. Dr. Rathje is the PI for the principally above-ground topics of earthquake hazard and risk assessment. Dr. Hennings is the PI for aspects of subsurface characterization and integration and is the principal liaison to the petroleum industry and CISR’s industrial partners. Margo Grace is the TexNet-CISR program coordinator.

The research collaboration is broad spanning:

  • Texas Bureau of Economic Geology (numerous groups)
  • UT Department of Civil, Architectural and Environmental Engineering
  • UT Institute for Geophysics
  • UT Department of Petroleum and Geosystems Engineering
  • SMU Department of Earth Sciences
  • Texas A&M Department of Petroleum Engineering
  • University of Houston Department of Earth and Atmospheric Sciences
  • University of Texas at Dallas Department of Geosciences
  • Southwest Research Institute
  • Stanford Center for Induced Seismicity Research
  • Golder Associates

TexNet-CISR Organization

TexNet-CISR Organization

 

Research Goals and Themes

The TexNet-CISR research portfolio will have defined value and impact. The overarching goals are to:

  • detect and catalog earthquakes
  • disseminate earthquake data
  • improve causative understanding
  • clarification of risk and hazard
  • develop mitigation strategies
  • improvements to practices
  • broad fact-based communication

These challenging individual research themes are connected in an integration plan whereby results and dependencies are shared to maximize the strengths of the component areas. The projects are connected by deliverables and timing as shown here:

TexNet-CISR Research Matrix

TexNet-CISR Research Matrix

 

TexNet-CISR will serve the specific geography and geology of Texas, and therefore the research portfolio contains overarching themes as well as geographically-specific phases. Seismicity monitoring began state-wide in 2017 using the backbone array of TexNet seismic stations. Portable seismic stations are deployed in areas of anomalous seismicity such as DFW, northeast of Snyder, Permian Basin, and the Eagle Ford operating area of south Texas. Please visit the TexNet Seismic Observatory site for more details on monitoring.

As per the graphic below, the first geographic thrust is an integrated assessment of the seismicity history and potential of the Ft. Worth Basin and DFW area and how it might relate to oil and gas operations. This will take several years to complete ending in 2019. However, in 2017 TexNet-CISR’s efforts will begin to include other areas of Texas such as the Permian Basin region and the Eagle Ford operating area. While efforts in the DFW area come to conclusion the research team will be focusing increasing efforts in the greater Permian Basin region.

 

Geographic Timing of Operations and Research Emphases

Geographic Timing

 

Principal efforts in the 2017-19 time-period include:

  • TexNet field and management operations including obtaining USGS authoritative source designation
  • TexNet optimization: (re)deployment of portable stations, velocity models, signal analysis
  • Accelerate seismicity research: advanced location characterization, accelerated seismicity, seismic fault characterization and moment tensor analysis
  • Seismicity characterization of key areas including DFW, northeast of Snyder, Permian Basin region and especially the Delaware Basin, the Eagle Ford Operating area south of San Antonio
  • Develop searchable catalog of Texas historical seismicity from all possible sources
  • Finish Ft Worth Basin seismicity assessments and publish results
  • Permian Basin and Eagle Ford region subsurface data integration, reservoir property characterization, and 3D geological model construction
  • Accelerate investigations of mechanistic analyses in the DFW and Permian Basin areas
  • Progress earthquake hazard and risk analysis topics including Vs30 characterization, vulnerability assessments, time-dependent hazard and risk analysis
  • Maintain strong interface with TX Legislators, CISR IA Mbrs, RRC, TDEM, USACE, SCITS, RISC States, impacted communities
  • Formalize and implement sustainable outreach program
  • Continue recruiting and building staff breadth/depth, appropriate utilization of incumbent experts in all partner institutions

In April of 2018 the TexNet-CISR research team finalized planning and of the 2017-19 project base which is now fully active. This portfolio has some projects that are continuing from the 2015-17 project list, some projects that are continuing but have been reframed to best fit the new portfolio, and some projects are new. Please follow the TexNet-CISR Research Projects link on the right for details.

 

Merged TexNet-CISR 2017-19 Project Portfolio

Merged TexNet-CISR Portfolio update

 

Over the 2015-19 time-period and beyond, this base of projects will spatially overlap as appropriate so that static elements such as earthquakes, injection data, and geologic characterizations are completed to facilitate dynamic analyses such as fluid flow and modeling and integrated assessments of the causes of the earthquakes. Here is a general layout of the overlapping geography of these study elements:

Integration Footprint of TexNet-CISR Project Areas

footprint

 

Given the high number of earthquakes in the Delaware Basin recorded by TexNet since its 2017 inception and the keen interest of the TexNet technical Advisory Committee and our CISR member companies, the TexNet-CISR research team will be focusing special attention on the region of West Texas as shown in the map below. In this area, CISR member companies have been asked to share certain proprietary subsurface data to facilitate our integrated studies of the causes of the earthquakes.

TexNet-CISR Southern Delaware Basin Integration AOI

Southern Delaware AOI