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Delaney Park Geotechnical Array Dynamic Properties Inferred from the Magnitude 7.1 2018 Anchorage, Alaska, Earthquake Sequence
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.
Delaney Park Geotechnical Array Dynamic Properties Inferred from the Magnitude 7.1 2018 Anchorage, Alaska, Earthquake Sequence
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.
Delaney Park Geotechnical Array Dynamic Properties Inferred from the Magnitude 7.1 2018 Anchorage, Alaska, Earthquake Sequence
Kalkan, Erol (author) / Wen, Weiping (author) / Heo, YeongAe (author)
2020-10-24
Article (Journal)
Electronic Resource
Unknown
Turning Disaster into Knowledge: Geotechnical Aspects of the 2018 Mw 7.1 Anchorage Alaska Earthquake
| British Library Conference Proceedings | 2020
| Taylor & Francis Verlag | 2022
David Chipperfield : Anchorage Museum, Anchorage, Alaska
Online Contents | 2010