5b: Recent Field Activities and Data Dissemination Efforts
Robert Nigbor1, Jennifer Swift2, Jean-Paul Bardet3, John Diehl4
ROSRINE, the Resolution of Site Response Issues in the 1994 Northridge Earthquake,
is an ongoing government-academia-industry research collaboration focused on
improving engineering models of earthquake ground motion through collection,
synthesis, and dissemination of data on subsurface conditions at key strong
ground motion (SM) station sites in California (Nigbor et al. 2001). Since 1996
a total of more than 50 SM sites have been characterized using drilling, borehole
logging, surface geophysics, and laboratory testing; V30 results show that many
sites have previously been misclassified. Currently under way, the PEER Lifelines
project ROSRINE Phase 5b (Project 2A01) includes investigations of the SM sites
in California shown in figure 1. Data are publicly disseminated through the
projects website http://geoinfo.usc.edu/rosrine.
Fig.1. Locations of current ROSRINE Phase 5b site investigations (white dots).
Shaded relief basemap (Sterner 1995)
ROSRINE 5b field investigations at the selected SM sites include:
collection of information from previous site investigations
obtaining permissions and permits
drilling to 100 m (soil sites) or 30 m (rock sites)
lithology logging during drilling
collection of SPT samples for index property testing
collection of high-quality samples (Pitcher or Shelby tube) for dynamic laboratory testing
measurement of P- and S-wave velocity profiles (figure 2)
Investigations are carried out under ROSRINE procedures and within a formal
quality assurance environment to ensure reliable data.
In a related PEER Lifelines effort, Professor Kenneth Stokoe will lead a team from the University of Texas, Austin, in measuring Vs profiles using seismic analysis of surface wave (SASW) methods at approximately 15 strong motion sites in Southern California. This work will be done later this year and the results will be added to the ROSRINE website.
Fig. 2. ROSRINE 5b P- and S-wave logging results
from Yermo, April 25, 2001
Laboratory testing of soil/rock samples has been a central component
throughout the various phases of the ROSRINE project. Simple index property
testing is an important part of the site geotechnical site characterization
and is now being done by certified commercial laboratories.
Dynamic soil testing has been performed at the University of Texas, Austin, and at the University of California, Los Angeles, on high-quality samples collected from ROSRINE boreholes. Further testing will be done later this year under separate PEER Lifelines funding (Project 2B01/02).
An integrated system based on the Relational Database Management System (RDBMS),
the Geographic Information System (GIS), and the Internet Map Server (IMS) was
recently developed at the University of Southern California (USC) by Ph.D. Research
Associate Jennifer Swift and Professors Jean-Pierre Bardet and Robert Nigbor
to disseminate the geotechnical data of ROSRINE over the Internet (Swift et
al. 2001). Within the framework of this particular large-scale collaborative
research project in geotechnical earthquake engineering and engineering seismology,
RDBMS, GIS, and IMS technologies were combined to efficiently collect, organize,
and disseminate an increasing amount of information, including soil boreholes,
shear-wave velocity profiles, technical drawings, photographs, and basic information
on associated strong motion stations. In 2000, the first ROSRINE website (established
in 1998) was upgraded from conventional static HTML pages that contained a limited
amount of data to a dynamic website that handles increasingly complicated and
voluminous information (http://geoinfo.usc.edu/rosrine/).
The integration of RDBMS, GIS, and IMS allows users to query spatially geotechnical,
geophysical, and laboratory data and allows web operators to maintain data more
efficiently. In 2001 this technology was further improved to include a combination
of Microsoft Access, custom Active Server Pages (ASP), ESRIs ArcView,
ArcView IMS, Avenue and Dynamic Hypertext Markup Language (DHTML) custom programming
to process the end-user queries with increased efficiency. Data from recent
phases of ROSRINE performed at sites in California in late 1999, early 2000,
as well as from Phase 5b will be available in the near future. The ROSRINE pioneering
effort in displaying and disseminating data within the geotechnical earthquake
engineering community over the Internet may be useful as a model for other projects
in engineering communities dealing with large-scale data collection.
ROSRINE Phase 5a, funded jointly by Kajima Corporation and the Nuclear Power
Engineering Corporation (NUPEC) of Japan, is part of a study of near-field seismic
design criteria for nuclear power plants in Japan. ROSRINE 5a investigations
were performed at the following sites in California in late 1999 and early 2000:
El Centro #7 (Imperial Valley College); Devers Substation; North Palm Springs;
Desert Hot Springs; Corralitos; and Gilroy #6. In addition, extensive array
microtremor measurements were conducted in Imperial Valley to investigate deep
(<6 km) structure. Data from these additional sites will be available through
a memorandum of understanding between PEARL/PEER (Pacific Gas and Electric Company,
California Energy Commission, and the California Department of Transportation/Pacific
Earthquake Engineering Research) and Kajima when matching data from ROSRINE
are provided to Kajmia/NUPEC.
Site characterization methodologies developed within the ROSRINE project are being included in strong motion station guidelines under development for the Advanced National Seismic System (ANSS).
Many analytical studies of site response have used and are using ROSRINE data.
In order to preserve this information resource for the future, the community
(through a Consortium of Organizations for Strong Motion Observation Systems
(COSMOS) working group) is looking at development of unified geotechnical data
storage and dissemination for ROSRINE and other similar projects. Later this
year a PEER-sponsored workshop will attempt to resolve issues and move forward
ROSRINE 5b (PEER 2A01) is led by Robert Nigbor (PI) of USC and John Diehl (co-PI)
of GeoVision Geophysical Services. Jennifer Swift of USC is responsible for
the data dissemination and many of the new database features. The ROSRINE Technical
Advisory Committee (Don Anderson, Cliff Roblee, Bob Nigbor, Bob Pyke, John Schneider,
Walt Silva, and Jon Stewart) oversees the various ROSRINE activities. Sandy
Jack, Tony Martin, Rob Steller and many others have assisted with the field
investigations. J.P. Bardet continues to provide valuable assistance with database
technologies, and hosts ROSRINE within his GEOINFO website http://geoinfo.usc.edu.
Nigbor, R. L., J. Diehl, and J. Swift. 2001. Characterization
of US Sites: ROSRINE 5B, PEER Lifelines Research Project 2A01 Site Response.
Presented at 2001 PEER Annual Meeting, Oakland, Calif., January 2526.
Swift, J., J.-P. Bardet, R. L. Nigbor, and J. Hu. 2001. An Integrated RDBMS-GIS-IMS system for dissemination of information in geotechnical earthquake engineering. Submitted to Computers & Geosciences.
Sterner, R. 2001. Shaded relief map of California, from Color landform atlas of the United States website: http://fermi.jhuapl.edu/states/, Johns Hopkins University Applied Physics Laboratory, http://fermi.jhuapl.edu/.
1Research Associate Professor of Civil Engineering, University
of Southern California
2Research Associate, University of Southern California
3Professor of Civil Engineering, University of Southern California
4President, GeoVision Geophysical Services, Corona, California