Seismic Noise Levels in Northern Baja California, Mexico

Research Article| February 05, 2019 Seismic Noise Levels in Northern Baja California, Mexico Erik E. Ramírez; Erik E. Ramírez aUniversidad Autónoma de Baja California (UABC), Instituto de Ingeniería, Calle de la Normal S/N, Insurgentes Este, 21280 Mexicali, Baja California, Mexico, ramirez.erik@uabc.edu.mx, jorger@uabc.edu.mx Search for other works by this author on: GSW Google Scholar J. Antonio Vidal‐Villegas; J. Antonio Vidal‐Villegas bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx Search for other works by this author on: GSW Google Scholar M. Alejandra Nuñez‐Leal; M. Alejandra Nuñez‐Leal bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx Search for other works by this author on: GSW Google Scholar Jorge Ramírez‐Hernández; Jorge Ramírez‐Hernández aUniversidad Autónoma de Baja California (UABC), Instituto de Ingeniería, Calle de la Normal S/N, Insurgentes Este, 21280 Mexicali, Baja California, Mexico, ramirez.erik@uabc.edu.mx, jorger@uabc.edu.mx Search for other works by this author on: GSW Google Scholar Adán Mejía‐Trejo; Adán Mejía‐Trejo cUniversidad Autónoma de Baja California (UABC), Instituto de Investigaciones Oceanológicas (IIO), Carretera Ensenada‐Tijuana 3917, Fraccionamiento Playitas, 22860 Ensenada, Baja California, Mexico, amejia@uabc.edu.mx Search for other works by this author on: GSW Google Scholar Eliana Rosas‐Verdugo Eliana Rosas‐Verdugo bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx Search for other works by this author on: GSW Google Scholar Author and Article Information Erik E. Ramírez aUniversidad Autónoma de Baja California (UABC), Instituto de Ingeniería, Calle de la Normal S/N, Insurgentes Este, 21280 Mexicali, Baja California, Mexico, ramirez.erik@uabc.edu.mx, jorger@uabc.edu.mx J. Antonio Vidal‐Villegas bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx M. Alejandra Nuñez‐Leal bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx Jorge Ramírez‐Hernández aUniversidad Autónoma de Baja California (UABC), Instituto de Ingeniería, Calle de la Normal S/N, Insurgentes Este, 21280 Mexicali, Baja California, Mexico, ramirez.erik@uabc.edu.mx, jorger@uabc.edu.mx Adán Mejía‐Trejo cUniversidad Autónoma de Baja California (UABC), Instituto de Investigaciones Oceanológicas (IIO), Carretera Ensenada‐Tijuana 3917, Fraccionamiento Playitas, 22860 Ensenada, Baja California, Mexico, amejia@uabc.edu.mx Eliana Rosas‐Verdugo bCentro de Investigación Científica y de Educación Superior de Ensenada (CICESE), División Ciencias de la Tierra, Carretera Ensenada‐Tijuana 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico, vidalv@cicese.mx, anunez@cicese.mx, eliana.rosas@uabc.edu.mx Publisher: Seismological Society of America First Online: 05 Feb 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (2): 610–620. https://doi.org/10.1785/0120180155 Article history First Online: 05 Feb 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Erik E. Ramírez, J. Antonio Vidal‐Villegas, M. Alejandra Nuñez‐Leal, Jorge Ramírez‐Hernández, Adán Mejía‐Trejo, Eliana Rosas‐Verdugo; Seismic Noise Levels in Northern Baja California, Mexico. Bulletin of the Seismological Society of America 2019;; 109 (2): 610–620. doi: https://doi.org/10.1785/0120180155 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract We performed a seismic noise‐level analysis from records of seismic stations located in northern Baja California, Mexico. We used data from stations of the Northwest Mexico Seismic Network, with the goal to characterize the noise spectrum for each station as a function of time. The seismic stations are located in the sedimentary environment of the Mexicali Valley (MV) and the granitic Peninsular Ranges of Baja California (PRBC). The ambient seismic noise was characterized using the power spectral density (PSD) technique (Peterson, 1993). We found that, at periods between 0.1 and 2 s, the median noise levels (MNLs) of stations in the MV are up to 25 dB higher, and near the new high‐noise model (NHNM), than MNLs of PRBC stations. For periods >2 s⁠, the MNLs are similar for both regions and are between the NHNM and new low‐noise models. We found differences in the noise levels when seismic sensors (different brands but same bandwidth) were interchanged. For periods <1 s⁠, the MNLs computed from records of Güralp sensors are ∼20 dB higher than MNLs from Nanometrics sensors; for periods >10 s the MNLs of Nanometrics sensors are ∼20 dB higher than the MNLs from Güralp sensors. We observed daily variations in short‐period noise, related to human activity, such as higher noise levels for periods <1 s at daylight in a station in the city of Mexicali. No influence of variations of the sea level of the Pacific Ocean on the PSD of stations of north Baja California was observed. At least for two sites, in and south of MV, there is a direct relationship among variations of pressure and temperature with seismic noise: high pressure and low temperature are related with high‐noise levels in the 4.0–8.5 s period band and vice versa. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.