Abstract Obtaining the S-wave velocity structure of geotechnical layers is critical for assessing local site effects during earthquakes. Although intrusive approaches provide accurate results, their high costs and logistical constraints limit widespread application. Nonintrusive using surface collected seismic data are more practical but often suffer from significant non-uniqueness due to inherent nonlinearity multiparameter nature geophysical inversion. This study addresses these challenges...

Research Article| September 26, 2017 On the Amplitude Discrepancy of HVSR and Site Amplification from Strong‐Motion Observations Mianshui Rong; Rong aInstitute Crustal Dynamics, China Earthquake Administration, No. 1, Anningzhuang Road, Haidian District, Beijing 100085, China, waltrong@126.comluyj1@263.netfAlso at Institute Geology Geophysics, Chinese Academy Sciences, 19, Beitucheng Western Chaoyang 100029, China. Search for other works by this author on: GSW Google Scholar Li‐Yun Fu; Fu...

Research Article| March 27, 2018 Estimating Site Response with Recordings from Deep Boreholes and HVSR: Examples the Mississippi Embayment of Central United States N. Seth Carpenter; Carpenter aKentucky Geological Survey, University Kentucky, 228 Mining Mineral Resources Building, Lexington, Kentucky 40506‐0107, seth.carpenter@uky.edu, zmwang@uky.edudAlso at Department Earth Environmental Sciences, 101 Slone 40506‐0053. Search for other works by this author on: GSW Google Scholar Zhenming...

ABSTRACT This study used 306 accelerograms recorded at 22 strong-motion stations to investigate the source parameters, quality factor (Q), and site effects of S-wave Fourier acceleration amplitude spectrum (FAS) 2019 MS 6.0 Changning earthquake sequence in China with surface-wave magnitudes (MS) 4.1–6.0. The generalized inversion technique (GIT) was adopted. inverted stress drop mainshock 1.15 MPa, those aftershocks varied from 0.11 1.04 MPa an average value 0.43 MPa. these earthquakes were...

The imaging of subsurface soil velocity structures from ambient noise inversion is a difficult problem. Few recording points and simplified 1-D layered profile lead to important non-uniqueness. From our point view, improving the reliability processing methods observed data obtain horizontal-to-vertical spectral ratio (NHV) curves setting complete model parameter space are tasks reduce non-uniqueness inversion. In this study, using local site near border Tonghai Basin, China, as case we first...

The horizontal-to-vertical spectral ratio (HVSR) and empirical transfer function analyses were performed on the S-wave recordings from two vertical borehole strong motion arrays: Garner Valley Downhole Array in southern California, KiK-net Ichinoseki-Nishi Vertical West Ichinoseki, Japan. results show that discrepancy between HVSR is mainly caused by significant site response of component, thus, incident P-waves are proposed to play an important role amplification. P-wave amplification...

The effect of local site conditions on the earthquake ground motion is a very important factor to be considered in engineering seismic fortification. Many methods, such as numerical simulation methods based analysis models and statistical empirical relation observations data, have been used consider effects actual fortification disaster assessment. obtain characteristic parameters condition strong microtremor records become an economical practical method determining designed sites,...

SUMMARY Given the improvements that have been made in forward calculations of seismic noise horizontal-to-vertical spectral ratios (NHVSRs) or earthquake ground motion HVSRs (EHVSRs), a number HVSR inversion methods proposed to identify underground velocity structures. Compared with studies on NHVSR inversion, research EHVSR-based is relatively rare. In this paper, make full use widely available and constantly accumulating strong-motion observation data, we propose an S-wave method based...

Equivalent Linear Method is a common way used in earthquake engineering to analyze nonlinear seismic response of soil layers, but the under severe underestimated by way. For analyzing more veritably, study, direct method was proposed and case for 1D analysis layers earthquake. The results obviously showed that, comparing with method, not only value also duration natural period range civil structures. adopted study fitful

Joint inversion of horizontal-to-vertical spectral ratios (HVSRs) and dispersion curves (DCs) from seismic noise recordings has been extensively used to overcome the lack uniqueness in noise-based HVSR (NHV) or DC inversions alone. Earthquake contain information about structural properties sedimentary layers provide body-wave data complementary estimate site velocity structures, particularly high-frequency band. We propose a joint Rayleigh wave obtained array measurements earthquake-based...

SUMMARY The diffusion field theory has been widely used to interpret ambient noise wave fields. Based on this theory, 1-D subsurface velocity structure inversion method is developed. However, few studies have referred the horizontal vertical (NHV) spectral ratio of 3-D structures, and almost no effective NHV tools To develop a useful tool for obtaining soil layer we combined forward calculation formula derived from with guided Monte Carlo algorithm then extended single-point multipoint joint...

Abstract Site resonance frequency is a crucial parameter for estimating site effects. However, there currently no consensus on how to identify the bedrock interface obtain frequency. In this study, we identified 43 stations that can be regarded as one‐dimensional sites from KiK‐net network in Japan, which consists of 699 stations. By analyzing horizontal‐to‐vertical spectral ratio and surface‐to‐borehole strong motion observation recordings, fundamental ( f 0 ) these was determined....

The north-south seismic belt of China poses a high risk earthquakes, necessitating the need for accurate and rapid prediction intensity measures (IMs) to prevent mitigate potential damage. We have developed new multi-task model, CRAQuake, predict IMs China. Using initial arrival waves recorded at single station as input, CRAQuake simultaneously predicts six without relying on pre-configured parameters such earthquake source, path, location. model was trained 4281 sets strong motion records...

Abstract The north‐south seismic belt of China poses a high risk earthquakes, necessitating the need for accurate and rapid prediction intensity measures (IMs) to prevent mitigate potential damage. We have developed new multi‐task model, CRAQuake, predict IMs China. Using initial arrival waves recorded at single station as input, CRAQuake simultaneously predicts six without relying on pre‐configured parameters such earthquake source, path, location. model was trained 4,281 sets strong motion...

A multi-transmitting boundary is a local artificial widely used for numerically simulating seismic site effects. However, similar to other boundaries, the has instability issue in numerical simulation. Based on concept of multi-directional transmitting formula, strategy eliminating high-frequency studied and measure proposed using neighbour node realize smoothing filtering. The verified through analysis. coefficient chosen this provides reference deriving multidirectional formula time domain.

ABSTRACT Scattering sensitivity of waves to surface roughness has been widely observed in many fields. Some series approximations for rough scattering, such as the general Born, splitting, and preconditioned splitting series, are presented a numerical description scattering by multiscale surfaces. In fact, approximation is specific form series. Numerical tests with several benchmark models compared full-waveform solution Born investigate range validity approximations. The surfaces not...

Horizontal-to-vertical spectral ratio (HVSR) analysis and inversion were applied to S-waves from a large database of broadband seismic strong-motion recordings.The S-wave HVSR, in comparison with ambient noise ratio, contains much information on the shear-wave velocity structure.In other words, HVSR provides detailed structure, which can be better used for nonlinear site-response analysis.The results showed that improve or constrain soil profile obtained methods.