Article
Chemistry, Analytical
Maik Neukirch, Antonio Garcia-Jerez, Antonio Villasenor, Francisco Luzon, Mario Ruiz, Luis Molina
Summary: HVSR is a common tool for exploring near surface shear wave velocity structure, commonly used in earthquake risk assessments and civil engineering projects. Comparing FFT and HHT-based HVSR estimates, it was found that HHT may lead to better data fit, more suitable Vs model, and increased confidence in the achieved model.
Article
Environmental Sciences
Ravindra K. Gupta, Mohit Agrawal, Rashid Shams, S. K. Pal
Summary: We conducted one dimensional equivalent linear site response analysis on 11 soil profiles in Dhanbad city. Shear wave velocity models obtained from destructive and non-destructive surveys were used to examine the impact of subsoil on earthquakes at the ground surface. The results revealed the composition of alluvium deposits in Dhanbad city, such as silty sand, sandy clay, silt + sand, and sand + clay mixture. The findings provide valuable insights for Indian government agencies to mitigate earthquake effects and build a resilient society.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Richard Alfaro-Diaz, Ting Chen
Summary: The study utilized a large -N seismic array to generate a shallow subsurface model of shear-wave velocity at the SPE phase II site, revealing two significant seismic impedance interfaces. The results support and extend previous understanding of the site's structure, demonstrating that the HVSR method in conjunction with a large -N seismic array is an effective method for investigating shallow structures.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Engineering, Geological
Enrico Lunedei, Dario Albarello
Summary: The seismic ambient vibrations model presented utilizes a random wavefield generated by correlated aleatory forces on the surface of a flat layered weakly-dissipative Earth. The frequency-dependent spatial correlation among these sources is parametrized by considering the role of sea-wave dynamics in generating ambient vibrations, allowing for a realistic description of the average power spectral density function observed worldwide under reference soil conditions. The effectiveness of the model is demonstrated by reproducing observed average Horizontal-to-Vertical Spectral Ratios at a well documented site in Northern Italy.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Marine
Qingsheng Meng, Yang Li, Wenjing Wang, Yuhong Chen, Shilin Wang
Summary: This study assesses the liquefaction hazards of silt sediments using the horizontal-to-vertical spectral ratio method. The dynamic parameters of the silt, such as the fundamental frequency, amplification, and vulnerability index, were used to evaluate the liquefaction potential. The results show that different areas have different stable ranges of values for the fundamental frequency, and the new method for identifying fundamental frequency is reliable and applicable.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Geological
Joseph P. Vantassel, Andrew C. Stolte, Liam M. Wotherspoon, Brady R. Cox
Summary: HVSR (horizontal-to-vertical spectral ratio) is a widely used tool for measuring the resonant behavior of a site. Traditional methods for processing HVSR measurements can be tedious and time-consuming when dealing with complex HVSR with multiple resonances. This work proposes the AutoHVSR algorithm, which allows for fully-automated processing of HVSR measurements, including those with zero, one, or multiple clear resonances. The algorithm demonstrates excellent performance and significantly reduces processing time compared to traditional methods.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Rong Xu, Lanmin Wang
Summary: The HVSR method has been widely applied in site characterization and mineral exploration, with controversies existing in distinguishing source effects from site effects and discrepancies between noise and earthquake recordings. Borehole data is considered the most reliable method in practice, and shear wave comparison is used to describe site response.
EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING
(2021)
Article
Geography, Physical
Sushil Kumar, Priyamvada Singh, Rama Sushil, Pitam Singh, Anil Tiwari
Summary: The study utilized the HVSR method to estimate the resonance frequency of ground motion at different sites, revealing a correlation between sedimentary thickness and resonance frequency with the geological setting of the study area. The results indicate high vulnerability of most sites to seismic risks with significant amplification of seismic waves, providing insight into the seismic hazard of the Sikkim region.
QUATERNARY INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Noel Zavala, Alejandro Clemente-Chavez, Angel Figueroa-Soto, Mario Gonzalez-Martinez, Rashad Sawires
Summary: The study conducted in Queretaro city utilized HVSR technique for seismic hazard assessment, with conclusions drawn from microtremor measurements at 76 selected sites and seismic hazard maps generated for the region.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Engineering, Geological
Bhargavi Podili, K. P. Sreejaya, S. T. G. Raghukanth, D. Srinagesh, C. V. R. Murty
Summary: This paper presents a study on the characteristics of V/H ratio of Indian ground motion records, finding that the majority of records exceed the Indian seismic design code norm. New V/H spectral ratio models are developed for Western Himalayas and North-East India, considering various factors and showing good performance compared to global models.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Pengfei Wang, Paolo Zimmaro, Sean K. Ahdi, Alan Yong, Jonathan P. Stewart
Summary: This study examines the identification of site resonances and the differences in horizontal-to-vertical spectral ratios (HVSRs) derived from different instruments for recording microtremors and seismic ground motions. It proposes a method for peak identification by considering peak amplitudes and widths, and finds that accelerometers with a broad full scale show a high rate of false negatives in HVSRs derived from microtremors. In contrast, HVSRs derived from seismometers have a higher consistency and reliability. Furthermore, it indicates that the use of earthquake-related HVSRs for site response models may overestimate model effectiveness, and mHVSRs are preferred for consistency.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2023)
Article
Physics, Multidisciplinary
Gilberto Saccorotti, Carlo Giunchi, Michele D'Ambrosio, Sonja Gaviano, Luca Naticchioni, Domenico D'Urso, Davide Rozza, Alessandro Cardini, Andrea Contu, Francesca Dordei, Matteo Cadeddu, Matteo Tuveri, Carlo Migoni, Michele Punturo, Annalisa Allocca, Enrico Calloni, Giovanni Luca Cardello, Luca D'Onofrio, Nazanin Davari, Daniele Dell'Aquila, Rosario De Rosa, Massimo Carpinelli, Luciano Di Fiore, Matteo di Giovanni, Luciano Errico, Irene Fiori, Maria Concetta Tringali, Jan Harms, Soumen Koley, Vittorio Longo, Ettore Majorana, Valentina Mangano, Marco Olivieri, Federico Paoletti, Luca Pesenti, Paola Puppo, Piero Rapagnani, Massimiliano Razzano, Fulvio Ricci, Valeria Sipala, Iara Tosta e Melo, Lucia Trozzo
Summary: This paper describes the operation of a temporary seismic array deployed near the dismissed mine of Sos Enattos. The spectrum characteristics around the mine are found to be related to vehicle traffic. A dispersion curve for Rayleigh waves is derived using correlation properties of seismic noise, providing an assessment of the elastic properties of rock materials at the candidate site.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Geosciences, Multidisciplinary
Xiaojun Li, Na Li, Mianshui Rong, Qing Dong
Summary: The effect of local site conditions on earthquake ground motion is crucial in engineering seismic fortification. This study proposes a novel evaluation method based on a modified horizontal to vertical spectral ratio, which considers the influence of soil layers on vertical ground motion. The method characterizes the influence of site conditions on ground motion more reasonably than traditional methods.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Rong Mianshui, Fu Li-Yun, Sanchez-Sesma Francisco Jose, Sun Weijia
Summary: The joint inversion of horizontal-to-vertical spectral ratios (HVSRs) and dispersion curves (DCs) from seismic noise recordings is an important approach to overcome the lack of inversion uniqueness in noise-based HVSR or DC inversions alone. In this study, we propose a new method that combines the Rayleigh wave DC obtained from array measurements with earthquake-based HVSR to estimate site velocity structures. Our sensitivity analyses show that the DC is sensitive to bedrock shear-wave velocities in the low-frequency range, while the earthquake-based HVSR is more sensitive to sediment thicknesses almost over the entire frequency range. The joint inversion is implemented using a hybrid global optimization scheme and is validated using synthetic models. The results applied to real data suggest that the joint inversion is an efficient method to estimate site velocity structures.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Rosalba Maresca, Luigi Guerriero, Giuseppe Ruzza, Neri Mascellaro, Francesco Maria Guadagno, Paola Revellino
Summary: This work focuses on utilizing ambient vibration monitoring to understand the changes in material properties and resonance directivity in landslides caused by seasonal behavior. The study was conducted on the Pietrafitta landslide in southern Italy, which is known to affect the SS87 National Road and is influenced by artificial vibrations. The field experiment involved four two-day-long measurement cycles between April and November 2016, using two broad-band three components velocimetric stations. The results showed daily variations in amplitude due to vehicular traffic and long-term variations in amplitude and frequency content at the landslide site. Polarization and directional resonance exhibited daily variations, with the most coherent results observed at night hours in the range of 20 degrees - 60 degrees, without traffic. The most significant resonance effect was found in the April recordings. The observed horizontal-to-vertical spectral ratio curves changed over time, indicating seasonal consolidation and decrease in landslide activity.
JOURNAL OF APPLIED GEOPHYSICS
(2022)