SESAC September 13, “Thoughts on the USGS role in the Intermountain West, in the context of hazard evaluation in extensional settings” John G. Anderson Director, Nevada Seismological Laboratory Presentation to Scientific Earthquake Studies Advisory Committee September 13, 2004 Jackson Hole, Wyoming

SESAC September 13, Outline Background Scientific issues Organizational needs and concerns

SESAC September 13, About 25% of the total Pacific – North America plate motion takes place east of the Sierra Nevada mountains

1: 66.3% 2: 40.0% 12: 20.1% 4: 29.6% 3: 30.6% 32: 8.9% 5: 28.5% 20: 12.9% Population growth rate, US Census Bureau Annualized Earthquake Loss Ratio at the County Level Source: nationalatlas.gov, FEMA366, US Census Bureau

SESAC September 13, Conclusions on hazard and risk The total risk in this region is small compared to California. Individual households or businesses in the Basin and Range states face risks comparable to or greater than those affecting many residents of California. –The resident of Reno faces a higher hazard than the resident of San Diego. The population is growing fast.

SESAC September 13, Scientific Issues Monitor the hazard –ANSS & other networks Describe the hazard –Seismic hazard analysis Understand the hazard –Basin and Range Earthquake Center

SESAC September 13, Comment on USGS Role The USGS has pursued essential research targets. Extensive body of important results Commend Mark Peterson for reaching out to get community feedback on research priorities Need for better outreach

SESAC September 13, Monitor the Hazard: ANSS Has already made a big difference –Defer to other speakers on the agenda –Engineering community in Nevada remains keenly interested. –Concerns about stability of funding Question related to structural instrumentation: Once a structure is selected to be instrumented, who will install and maintain the instruements? Encourage vigorous support for ANSS from this committee and all levels of the USGS leadership. –We are ready to do our part to support you.

SESAC September 13, Monitoring Thought: USGS (ANSS) is not the only agency supporting seismic monitoring in the region. –DOE (might spend more) –NSF: not only Earthscope –Other federal agencies We appreciate USGS for it’s commitment and long-term perspective, while other agencies are focused on specific problems and can be unreliable. Encourage USGS to develop ANSS in a way that is consistent with long term planning for network operators, in the context of the multiple sources of funding.

SESAC September 13, ANSS portable arrays Site response at long periods in urban areas: temporary (& a few permanent) deployment of broadband seismometers. What are the plans? –Recognize that structures are highest ANSS priority. –Especially important in our region. (Basins, Activity rate) –We at UNR believe those instruments will play an important role in hazard reduction, and are willing to host one of the portable arrays that would be used between earthquakes to focus on site characteristics.

SESAC September 13, Annual Rates of various earthquake types: (preliminary estimates) M≥7.0M≥8.0 Global total171 Subduction zone, deep, other15~1 Continental thrust1~0.05? Continental strike slip1~0.1? Continental normal <<1

SESAC September 13, Instrumentation Beyond ANSS New paradigm on how to create a widely distributed strong motion network –No chance for Federal funding to support strong motion at the density needed to solve all the problems. Japanese networks: Yokohama, Tokyo –Support development of new approaches Embrace it if private industry comes up with a way.

SESAC September 13, Describe the Hazard National Seismic Hazard Maps: Exceptionally valuable! As USGS already recognizes, need to continue improve.

SESAC September 13, Source: Pancha (personal communication)

SESAC September 13, Source: Geoff Blewitt, Corne Kreemer, data Mark Coolbaugh, plot

SESAC September 13, Source: Aasha Pancha (personal communication)

SESAC September 13, Characterize faults, emphaisize near urban areas Velocity structure Create “Community models” for both Ground motion prediction Source physics Improve and test seismic hazard estimates. Scenarios to communicate results Nevada Priorities

SESAC September 13, Understand the hazard Needed: Basin and Range Earthquake Center –Model after Southern California Earthquake Center –Goal: accelerate progress to quantitative description of the hazard –Promote Earthscope goals. Proposal to NSF / Earthscope for a Great Basin center CVM/CFM

SESAC September 13, Characteristics of SCEC to copy Natural laboratory. In BREC case, the laboratory is extensional tectonics. Universities and USGS Annual meeting Community products (crustal motion, velocity, faulting) Vision of bringing all elements of earthquake science into a predictive science

SESAC September 13, Basin and Range Earthquake Center May involve some parties outside of geophysics –UNR has a structures lab, –close collaboration with Seismology –Interest in collaboration, supported by UNR administration Response of a bridge column to 1.35 x Rinaldi north component

SESAC September 13, What else can USGS do? Nevada Seismological Laboratory would welcome a USGS personnel to work on network seismology. –Western Great Basin –Mammoth eventually –Mendenhall postdoc? Other Basin & Range universities may think the same

SESAC September 13, What else can USGS do? Earthquake Prediction Evaluation Council –Almost needed one this past spring.

SESAC September 13, Summary The region has a significant and growing earthquake problem. We have a clear idea of what needs to be done. Resource issues. It is time to consider the advantages of forming a Basin and Range Earthquake Center