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PRJ-4844 | Microtremor Measurements Performed in Proximity to Strong Motion Stations Across California
PI
Co-PIs
Project Type
Field research | Geosciences
Natural Hazard Type(s)
Earthquake
Facilities
Keywords
HVSR, Microtremors, Seismometers
|
Description:
This project contains microtremor-based horizontal-to-vertical spectral ratio (mHVSR) data, collected from a series of field surveys conducted at various strong motion stations. The measurements were acquired using 3-component broadband seismometers, with recording durations typically ranging from 30 minutes to 1 hour. mHVSR is a well-established technique for identifying resonant features at sites with substantial impedance contrasts, where the lowest frequency peak in the mHVSR spectrum is often associated with the site’s fundamental frequency. This fundamental frequency is crucial for understanding site-specific seismic behavior and is particularly valuable for seismic hazard assessment and ground motion modeling. The datasets include not only the raw data collected during each survey but also processed outputs such as mean spectral curves, polar curves, Fourier Amplitude Spectra (FAS), and other relevant processing results. These processed data are intended to support further analysis and interpretation, particularly for applications related to site response studies and the characterization of local site conditions. The overall goals of our HVSR research are to develop a publicly accessible database of HVSR data for use in research, to develop effective protocols for analysis and interpretation of HVSR data, and to develop methods for predicting site response conditioned on HVSR data. The database has been established and is available in the United States Community Shear-Wave Velocity (VS) Profile Database (PDB) (https://www.vspdb.org/); the work presented in this doi is contributing to that database. The research presented here was supported by a research gift from the Pacific Gas and Electric (PG&E) Company and University of Southern California. This support is gratefully acknowledged.
Mission | Microtremor Data Collection in the Imperial Valley Basin, 2024
Cite This Data:
Ornelas, F., J. Stapleton, T. Buckreis, C. Nweke, J. Stewart (2025). "Microtremor Data Collection in the Imperial Valley Basin, 2024", in Microtremor Measurements Performed in Proximity to Strong Motion Stations Across California. DesignSafe-CI. https://doi.org/10.17603/ds2-6wpb-0r31
The Imperial Valley Basin (IVB) is a prominent sedimentary basin located in southern California, east of San Diego, within the Salton Trough. This tectonically active region, part of the San Andreas Fault system, is characterized by low-lying topography, with much of the Imperial Valley situated below sea level. The IVB is also subject to significant seismic activity, including movements along the Imperial and San Andreas Faults. As part of ongoing research efforts, 33 microtremor measurements were conducted at various locations within the region, specifically near strong motion stations. These measurements contribute to the development of the Shear Wave Velocity Profile Database (VSPDB) and the creation of a site response model conditioned on mHVSR.
Engineering/Geosciences Collection | Imperial Valley Data
We conducted 33 microtremor measurements at 16 locations throughout the Imperial Valley Basin, with a focus on sites in proximity to strong motion stations. These measurements are part of an effort to improve the existing VSPDB. These results can also be useful for the improvements of existing site response models.
Mission | Microtremor Data Collection in the San Fernando Valley Basin, 2024
Cite This Data:
Ornelas, F., J. Stapleton, T. Buckreis, C. Nweke, J. Stewart (2025). "Microtremor Data Collection in the San Fernando Valley Basin, 2024", in Microtremor Measurements Performed in Proximity to Strong Motion Stations Across California. DesignSafe-CI. https://doi.org/10.17603/ds2-yxm7-2p26
View Data
Date(s)
2024-04-22 ― 2024-04-22
Author(s)
; ; ; ;
Date Published
2025-04-04
DOI
10.17603/ds2-yxm7-2p26
License
Open Data Commons Attribution
Description:
The San Fernando Valley Basin (SFVB) is a notable sedimentary basin located in southern California, within the greater Los Angeles region. Situated between the Santa Monica Mountains to the south and the San Gabriel Mountains to the north, the SFVB is part of the Transverse Ranges geologic province. This basin is characterized by relatively flat topography, with an elevation that ranges from sea level to approximately 1,500 feet. The SFVB is seismically active due to its proximity to the San Andreas Fault system and the presence of the Sierra Madre and Santa Susana Faults. As part of ongoing research efforts, 12 microtremor measurements have been conducted throughout the region. These measurements will add to the Shear Wave Velocity Profile Database (VSPDB).
Engineering/Geosciences Collection | San Fernando Valley Data
We conducted 12 microtremor measurements at 6 sites across the San Fernando Valley basin area. These measurements are part of an effort to improve the existing VSPDB. These results can also be useful for the improvements of existing site response models.
Mission | Microtremor Data Collection in West LA Region, 2024
Cite This Data:
Ornelas, F., J. Stapleton, T. Buckreis, C. Nweke, J. Stewart (2025). "Microtremor Data Collection in West LA Region, 2024", in Microtremor Measurements Performed in Proximity to Strong Motion Stations Across California. DesignSafe-CI. https://doi.org/10.17603/ds2-kz21-za86
View Data
Date(s)
2024-04-18 ― 2024-04-18
Author(s)
; ; ; ;
Date Published
2025-04-04
DOI
10.17603/ds2-kz21-za86
License
Open Data Commons Attribution
Description:
The Los Angeles Basin (LAB) is a major sedimentary basin located in southern California, stretching across a broad area that includes much of the city of Los Angeles. This basin is part of the larger Transverse Ranges geologic province and is characterized by a mix of flat lowlands and coastal foothills. The LAB is situated near several active fault systems, including the San Andreas Fault to the north and the Newport-Inglewood Fault to the south, contributing to the region's significant seismic activity. The basin is composed of a range of sedimentary layers that affect seismic waves and ground motion during earthquakes. In the western part of the LAB, 18 microtremor measurements are performed at 8 sites. These measurements play a crucial role in refining the Shear Wave Velocity Profile Database (VSPDB).
We conducted 18 microtremor measurements at 8 sites across the Western part of the LA basin. These measurements are part of an effort to improve the existing VSPDB. These results can also be useful for the improvements of existing site response models.
