TY - JOUR
T1 - Site Response of the Vertical Ground-Motion
AU - Kamai, Ronnie
AU - Pe'Er, Gilboa
N1 - Funding Information:
This study was funded by the Israeli Science Foundation (ISF), under grant number 1392/16. Dr. Norm Abrahamson and Dr. Walt Silva are thanked for many helpful discussions. Dr. Silva is also thanked here for sharing his profile database with us. Finally, we thank Alan Yong, Steven Phillips, Ryan Mesmer, and Devin Galloway from the USGS for their helpful suggestions with regards to the use of the USGS online groundwater level database.
Publisher Copyright:
© 2018 American Society of Civil Engineers.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - In this study we explore, for the first time, the correlation of the vertical site amplification with alternative site-characterization proxies. Specifically, we use both S- and P-wave related proxies, to account for the joint contribution of these wave types within the vertical ground motion. We use surface recordings from large ground-motion databases and supplement the typical site metadata with additional metadata, including P-wave velocity profile and ground-water level (GWL). We find that the most effective predictor for vertical site-response is a combination of VS30, as a first-order proxy for the site-stiffness, together with the depth to ground-water level, which is an independent proxy affecting the P-wave velocity profile. When used together, these two parameters reduce the aleatory variability of ground motions by approximately 0.3 ln units. We further find that the correlation with these proxies greatly depends on magnitude and distance, linking back to the relative contribution of wave-types and its relation to the incidence angle.
AB - In this study we explore, for the first time, the correlation of the vertical site amplification with alternative site-characterization proxies. Specifically, we use both S- and P-wave related proxies, to account for the joint contribution of these wave types within the vertical ground motion. We use surface recordings from large ground-motion databases and supplement the typical site metadata with additional metadata, including P-wave velocity profile and ground-water level (GWL). We find that the most effective predictor for vertical site-response is a combination of VS30, as a first-order proxy for the site-stiffness, together with the depth to ground-water level, which is an independent proxy affecting the P-wave velocity profile. When used together, these two parameters reduce the aleatory variability of ground motions by approximately 0.3 ln units. We further find that the correlation with these proxies greatly depends on magnitude and distance, linking back to the relative contribution of wave-types and its relation to the incidence angle.
UR - http://www.scopus.com/inward/record.url?scp=85048899797&partnerID=8YFLogxK
U2 - 10.1061/9780784481462.059
DO - 10.1061/9780784481462.059
M3 - Conference article
AN - SCOPUS:85048899797
SN - 0895-0563
VL - 2018-June
SP - 608
EP - 618
JO - Geotechnical Special Publication
JF - Geotechnical Special Publication
IS - GSP 291
T2 - 5th Geotechnical Earthquake Engineering and Soil Dynamics Conference: Seismic Hazard Analysis, Earthquake Ground Motions, and Regional-Scale Assessment, GEESDV 2018
Y2 - 10 June 2018 through 13 June 2018
ER -