Delaney Park Geotechnical Array Dynamic Properties Inferred from the Magnitude 7.1 2018 Anchorage, Alaska, Earthquake Sequence
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VIEW CORRECTIONPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 1
Abstract
We used waveforms from the 2018 Anchorage earthquake and six selected aftershocks, ranging from to 5.7, to quantify site properties including shear-wave velocity profile, predominant frequencies, borehole amplification, soil-damping ratio, and shear modulus at Delaney Park in downtown Anchorage, Alaska. The waveforms were recorded by surface and six borehole (up to 61-m depth) three-component accelerometers. The deconvolution of the waveforms at various borehole depths on horizontal sensors with respect to the corresponding waveform at the surface provides incident and reflected traveling waves within the soil column. The shear-wave velocities determined from these events are consistent, and generally agree well with the in situ measurements. The borehole amplification based on surface-to-borehole traditional standard spectral ratio (SSR) and surface-to-borehole response spectral ratio (RSR) and cross-spectral ratio (c-SSR) were also evaluated. Based on c-SSR, we computed the borehole amplification as 4.8 at 1.35 Hz (0.74 s), close to the predominant frequency of the soil column.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. The fault lines in Fig. 2 were obtained from http://www.dggs.alaska.gov/pubs/id/24956 (last accessed August 2019), which included fault information from Koehler et al. (2012, 2013). Instruments of the National Strong Motion Network of USGS collected recordings used in this study. These recordings are available at http://nees.ucsb.edu/data-portal (last accessed August 2019). The MATLAB version R2018b of the deconvolution function used in this study is available at https://www.mathworks.com/matlabcentral/fileexchange/60644-deconvolution-of-two-discrete-time-signals-in-frequency-domain?s_tid=prof_contriblnk.
Acknowledgments
We thank two anonymous reviewers for their valuable comments, which helped improve the technical quality of this paper. Special thanks are extended to John Thornley for providing us in situ shear-wave measurements, Utpal Dutta and Joey Yang for discussions on DPK array soil properties, Luke Blair for generating the regional maps, and Shahneam Reza and Timothy Cheng for preparing the borehole array illustration. We are also grateful to Nori Nakata for fruitful discussions on deconvolution and for sharing his computer codes, which we modified significantly for this study.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 1 • January 2021
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© 2020 American Society of Civil Engineers.
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Received: Nov 26, 2019
Accepted: Jul 15, 2020
Published online: Oct 24, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 24, 2021
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