DOI: 10.1785/bssa0650040809. Statistical analysis of microearthquake activity near San Andreas geophysical observatory, Hollister, California

Statistical analysis of microearthquake activity near San Andreas geophysical observatory, Hollister, California

10.1785/bssa0650040809

Crossref journal-article

Seismological Society of America (SSA)

Bulletin of the Seismological Society of America (790)

Abstract

Abstract Microearthquake activity during the 4-year interval 1968 to 1971 in a region of 25 km radius, centered on the San Andreas fault near Hollister, has been monitored by means of high-gain high-frequency seismographs which allow detection of events as small as magnitude zero within the region. The distribution of the 4764 microearthquakes shows a high degree of clustering. The series of time intervals between consecutive shocks can be described approximately by a gamma distribution whose shape parameters for different samples change from 0.3 to 0.8. The exponential probability plots of the {Δti} series for 265 larger regional earthquakes over 10 years result in a constant value of the hazard function except for small values of time where the hazard is higher. The variance-time and intensity functions show a varying degree of interdependence between events for each year and a long-term dependence up to 80 days for the period 1968-1971. The time scale of clustering has been estimated. Inferences based on short-term microearthquake studies may be grossly misleading.

Bibliography

Udias, A., & Rice, J. (1975). Statistical analysis of microearthquake activity near San Andreas geophysical observatory, Hollister, California. Bulletin of the Seismological Society of America, 65(4), 809â827.

Authors 2

Agustin Udias (first)
John Rice (additional)

References 22 Referenced 54

10.4294/jpe1952.5.83 / J. Phys. Earth / Observations of nearby microearthquakes with ultra sensitive seismometers by Asada ((1957))
{'key': '2021092117173456900_BIB2', 'first-page': '1725', 'article-title': 'Seismological evidence on the tectonics of central and northern California and the Mendocino escarpment', 'volume': '58', 'author': 'Bolt', 'year': '(1968)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / Seismological evidence on the tectonics of central and northern California and the Mendocino escarpment by Bolt ((1968))
10.1785/BSSA0570020277 / Bull. Seism. Soc. Am. / Microearthquake survey of San Andreas fault system in southern California by Brune ((1967))
10.1007/978-94-011-7801-3 / The Statistical Analysis of Series of Events by Cox ((1966))
10.22201/igeof.00167169p.1967.7.2.1129 / Geofísica Internacional / Análisis estadístico de intervalos de tiempo de temblores sucesivos en la ciudad de México by Ferraes ((1967))
{'key': '2021092117173456900_BIB6', 'volume-title': 'Statistical Models in Engineering', 'author': 'Hahn', 'year': '(1968)'} / Statistical Models in Engineering by Hahn ((1968))
10.1785/BSSA05406A1871 / Bull. Seism. Soc. Am. / The statistics of earthquakes in southern California by Knopoff ((1964))
10.1029/RG004i003p00377 / Rev. Geophys. / Statistical prediction of earthquakes by Lomnitz ((1966))
{'key': '2021092117173456900_BIB9', 'article-title': 'Clustering in aftershock sequences', 'author': 'Lomnitz', 'year': '(1967)', 'journal-title': 'The Earth Beneath the Continents. Geophys. Monograph. 10, Am. Geophys. Union.'} / The Earth Beneath the Continents. Geophys. Monograph. 10, Am. Geophys. Union. / Clustering in aftershock sequences by Lomnitz ((1967))
10.1785/BSSA0560040899 / Bull. Seism. Soc. Am. / Microearthquake activity recorded by portable seismographs of high sensitivity by Oliver ((1966))
{'key': '2021092117173456900_BIB11', 'first-page': '1131', 'article-title': 'Aftershock and microaftershocks of the Great Alaska Earthquake of 1964', 'volume': '58', 'author': 'Page', 'year': '(1968)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / Aftershock and microaftershocks of the Great Alaska Earthquake of 1964 by Page ((1968))
{'key': '2021092117173456900_BIB12', 'article-title': 'Statistical methods of use in analyzing sequences of earthquakes', 'author': 'Rice', 'year': '(1974)'} / Statistical methods of use in analyzing sequences of earthquakes by Rice ((1974))
10.1785/BSSA0580020639 / Bull. Seism. Soc. Am. / Minimum recording times for determining short-term seismicity from microearthquake activity by Sanford ((1968))
10.1029/JB077i035p07049 / J. Geophys. Res. / Microearthquake clustering near Fairview Peak, Nevada and in the Nevada seismic zone by Savage ((1972))
10.1785/BSSA0620040917 / Bull. Seism. Soc. Am. / Statistical analysis of microearthquakes near Socorro, New Mexico by Singh ((1972))
{'key': '2021092117173456900_BIB16', 'first-page': '1765', 'article-title': 'A clustering model for earthquake occurrences', 'volume': '60', 'author': 'Schlien', 'year': '(1970)', 'journal-title': 'Bull. Seism. Soc. Am.'} / Bull. Seism. Soc. Am. / A clustering model for earthquake occurrences by Schlien ((1970))
10.1785/BSSA0550010085 / Bull. Seism. Soc. Am. / A study of the aftershocks and focal mechanism of the Salinas-Watsonville earthquakes of August 31 and September 14, 1963 by Udías ((1965))
{'key': '2021092117173456900_BIB18', 'article-title': 'Time and magnitude relations for three series of microaftershocks in central California', 'author': 'Udías', 'year': '(1975)'} / Time and magnitude relations for three series of microaftershocks in central California by Udías ((1975))
{'issue': '1', 'key': '2021092117173456900_BIB19', 'first-page': '1', 'article-title': 'Aftershocks and earthquakes statistics', 'volume': '4', 'author': 'Utsu', 'year': '(1972)', 'journal-title': 'IV. J. Fac. Sci. Hokkaido Univ. Ser. VII Geophys.'} / IV. J. Fac. Sci. Hokkaido Univ. Ser. VII Geophys. / Aftershocks and earthquakes statistics by Utsu ((1972))
{'key': '2021092117173456900_BIB20', 'first-page': '1', 'article-title': 'Stochastic models for earthquake occurrence', 'volume': 'B32', 'author': 'Vere-Jones', 'year': '(1970)', 'journal-title': 'J. Roy. Statist. Soc.'} / J. Roy. Statist. Soc. / Stochastic models for earthquake occurrence by Vere-Jones ((1970))
10.1080/00288306.1966.10422815 / New Zealand J. Geol. Geophys. / A statistical survey of earthquakes in the main seismic region of New Zealand. II. Time series analysis by Vere-Jones ((1966))
10.1093/biomet/49.3-4.525 / Biometrika / Estimation of parameters of the gamma distribution using order statistics by Wilk ((1962))

Dates

Type	When
Created	3 years, 11 months ago (Sept. 21, 2021, 2:15 p.m.)
Deposited	3 years, 11 months ago (Sept. 21, 2021, 2:15 p.m.)
Indexed	1 month, 3 weeks ago (July 4, 2025, 8:47 a.m.)
Issued	50 years ago (Aug. 1, 1975)
Published	50 years ago (Aug. 1, 1975)
Published Online	50 years ago (Aug. 1, 1975)
Published Print	50 years ago (Aug. 1, 1975)

Funders 0

None

BibTeX

@article{Udias_1975, title={Statistical analysis of microearthquake activity near San Andreas geophysical observatory, Hollister, California}, volume={65}, ISSN={0037-1106}, url={http://dx.doi.org/10.1785/bssa0650040809}, DOI={10.1785/bssa0650040809}, number={4}, journal={Bulletin of the Seismological Society of America}, publisher={Seismological Society of America (SSA)}, author={Udias, Agustin and Rice, John}, year={1975}, month=aug, pages={809–827} }

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