LB3D - A Dense Urban Seismic Network
in Long Beach, CA

In 2011 and 2012, unusual seismic surveys were done in urban Long Beach, Ca. Their purpose was to better define the Long Beach oilfield. The survey was done by NodalSeismic on behalf of Signal Hill Petroleum.

The first phase of the survey occurred in 2011 and consisted of approximately 5300 sensors that recorded continuously for 6 months. The second phase in 2012, used aproximately 2500 sensors to extend the original survey to east, and recorded continuously for 3 months.

Under agreement with Signal Hill Petroleum, these data were made available to Caltech for research on seismic processing and the seismic hazard in the Los Angeles Basin. We have online large portions of the first phase of the survey and all of the second phase. We thank Signal Hill Petroleum for permission to use their data in our research.

Detailed below is the research that we are doing with these data.

Participants

The participants in this research project are:

• Robert Clayton, Prof. of Geophysics, Caltech
• Victor Tsai, Prof. of Geophysics, Caltech
• Jean-Paul Ampuero, Prof. of Geophysics, Caltech
• Dan Hollis, VP Marketing and Technology, NodalSeismic
• Fan-Chi Lin, Postdoc, Caltech
• Brandon Schmandt, Postdoc, Caltech
• Dunzhu Li, Grad Student, Caltech
• Asaf Inbal, Grad Student, Caltech
• Magali Barba, Undergrad, UC Berkeley
• Julian Mejia, Undergrad, Caltech

Contents

Pages to be added:

• microzonation
• tectonics and geology of Long Beach

Publications

• Lin, F-C., D. Li, R. Clayton, and D. Hollis, Interferometry with a dense 3D dataset, SEG 2012 Extended Abstract. PDF
• Lin, Fan-Chi, D. Li, R. Clayton, D. Hollis, 2013, High-resolution shallow crustal structure in Long Beach, California: application of ambient noise tomography on a dense seismic array, Geophysics, 78(4), Q45-Q56, doi:10.1190/geo2012-0453.1 PDF
• Schmandt, B., and R. Clayton, Analysis of P-waves with a 5200-station array in Long Beach, California: evidence for abrupt boundary for Inner Borderland rifting, (2013), J. Geophys. Res., 118, 1-19, doi:10.1002/jgrb.50370 PDF
• Inbal, Asaf, F. Koch, R. Clayton, and J-P Ampuero, Locating micro-events in Long Beach, CA urban environment with a dense array, SEG Extended Abstracts, p 2129-2134, doi:10.1190/segam2013-0697.1 PDF