1. Surveying Seismic Microzonation in Urban Areas
Using Refraction Microtremor reconnaissance:
Rapid surveys take advantage of urban noise
More details at
J. Louie 12/10/2003

2. Refraction Microtremor for Shallow Shear Velocity
ReMi measures Rayleigh dispersion with linear refraction arrays (paper by Louie, April 2001 BSSA).
100-m depth resolution
Initial funding from SCEC, UNR, VUW, Optim LLC
J. Louie 12/10/2003

3. Refraction Microtremor for Shallow Shear Velocity
ReMi has classified hard and soft sites around the world by measuring V30, average shear velocity to 30 m depth.
J. Louie 12/10/2003

4. Reno Transect Local reconnaissance was first test.
Supported by UNR and IRIS-PASSCAL
J. Louie 12/10/2003

5. Reno Transect Unexpected results: high V30 in active alluvium. West
East Ta
J. Louie 12/10/2003

6. Reno Transect Lack of V30 correlation to geologic or soil maps
Only Tertiary Andesite (Ta) shows a characteristic V30
J. Louie 12/10/2003

7. The First Reno Hazard Map
J. Louie 12/10/2003

8. Shallow Shear-Velocity Transects
July 2003 San Gabriel Valley & Los Angeles B C D E
Transect mapped on NEHRP hazard class map by Wills, from SCEC Phase 3 Report
Supported by USGS, NEHRP ERP and IRIS-PASSCAL
J. Louie 12/10/2003

9. Los Angeles Transect 200 shallow Vs profiles from San Gabriel Riv.
San Gabriel Mts.
are C, not B.
Alamitos Bay
is D, not E.
V30 may correlate with hydraulic gradient.
J. Louie 12/10/2003

10. Los Angeles Transect
No V30 correlation with active vs. older alluvium; R2 = 0.2!
J. Louie 12/10/2003

11. Shallow Shear-Velocity Transects
Las Vegas route from Cheyenne to Tropicana
3-km-deep basin
1-km-deep basin
Supported by DOE-LLNL and IRIS-PASSCAL
J. Louie 12/10/2003

12. Las Vegas Transect Some correlation to faulting, soil type?
J. Louie 12/10/2003

13. Las Vegas Transect No correlation between V30 and geologic map.
J. Louie 12/10/2003

14. Las Vegas Transect Correlation with clay soils, caliche in Las Vegas?
J. Louie 12/10/2003

15. Las Vegas Transect
Shallow section & V100 hint at stratigraphy, faulting?
Fault?
Caliche?
J. Louie 12/10/2003

16. A Preliminary Las Vegas Hazard Map
Transect V30 values correlated with soil-map units across 4 quadrangles in Las Vegas Valley
J. Louie 12/10/2003

17. Outreach Example of public outreach:
Discoveries and Breakthroughs Inside Science, news shorts funded by AIP, AGU, etc.
KFSN-TV Fresno, CA
KGBT-TV Harlingen, TX
KJTV-TV Lubbock, TX
KTRK-TV Houston, TX
KNBC-TV Burbank, CA
KNSD-TV San Diego, CA
KQTV-TV St. Joseph, MO
KNTV-TV San Francisco, CA
KRQE-TV Albuquerque, NM
KTSM-TV El Paso, TX
KTVN-TV Reno, NV
KWQC-TV Davenport, IA
KXAS-TV Fort Worth, TX
WAGM-TV Presque Isle, ME
WTEN-TV Albany, NY
WCAU-TV Philadelphia, PA
WCMH-TV Columbus, OH
WCYB-TV Bristol, VA
WEWS-TV Cleveland, OH
WFTS-TV Tampa, FL
WLUK-TV Green Bay, WI
WBBH-TV Fort Myers, FL
WHIO-TV Dayton, OH
WIS-TV Columbia, SC
WJAR-TV Cranston, RI
WLBT-TV Jackson, MS
WMAQ-TV Chicago,IL
WNBC-TV New York, NY
WNCN-TV Raleigh, NC
KTSM-TV Omaha, NE
WPBN-TV Traverse City, MI
WSYM-TV Lansing, MI
WTVJ-TV Miami, FL
WVIT-TV Hartford, CT
WVTM-TV Birmingham, AL
WXYZ-TV Southfield, MI
WJXT-TV Jacksonville, FL
WTXL-TV Tallahassee, FL
WIVT-TV Binghamton, NY
WEVV-TV Evansville, IN
WCJB-TV Gainesville, FL
WPXI-TV Pittsburgh, PA
CHAT-TV Medicine Hat, ALB
K. Heineman, NewsProNet, Producers
Technology Transfer: Commercial ReMi is now in use by geotechnical consultants and agencies worldwide.
J. Louie 12/10/2003