Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

This paper presents the results of a fault hazard study performed as part of a proposed traffic tunnel project in Coronado, California. The 2.3 km alignment crosses the Coronado fault, which is considered active by the California Geological Survey. Although the location of the Coronado fault offshore of Coronado had been well established through previous studies, the fault had never been definitively located on land. A study was undertaken that utilized four principal investigation methods: a seismic reflection survey, large diameter borings, closely-spaced cone penetrometer tests (CPT) and a fault trench. This study was the first to positively locate the Coronado fault on land and to show that approximately 29 cm of vertical displacement has occurred in the Holocene. The field investigation provided evidence that strike slip displacement has also occurred. For design purposes, the strike slip offset was estimated using an empirical model and several kinematic models that integrated aspects of the local tectonic regime. Fault offset design criteria were established for the project that accounted for uncertainty in the fault zone location and the potential for secondary faulting outside the primary fault zone.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Fault Hazard Characterization for a Transportation Tunnel Project in Coronado, California

San Diego, California

This paper presents the results of a fault hazard study performed as part of a proposed traffic tunnel project in Coronado, California. The 2.3 km alignment crosses the Coronado fault, which is considered active by the California Geological Survey. Although the location of the Coronado fault offshore of Coronado had been well established through previous studies, the fault had never been definitively located on land. A study was undertaken that utilized four principal investigation methods: a seismic reflection survey, large diameter borings, closely-spaced cone penetrometer tests (CPT) and a fault trench. This study was the first to positively locate the Coronado fault on land and to show that approximately 29 cm of vertical displacement has occurred in the Holocene. The field investigation provided evidence that strike slip displacement has also occurred. For design purposes, the strike slip offset was estimated using an empirical model and several kinematic models that integrated aspects of the local tectonic regime. Fault offset design criteria were established for the project that accounted for uncertainty in the fault zone location and the potential for secondary faulting outside the primary fault zone.