{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T18:37:54Z","timestamp":1773081474043,"version":"3.50.1"},"reference-count":39,"publisher":"Seismological Society of America (SSA)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1978,8,1]]},"abstract":"<jats:title>abstract<\/jats:title>\n               <jats:p>This paper reports preliminary results of an analysis of the spectral content of seismic waves from over 1,000 local earthquakes in the Garm, Tadjikistan region. Very low values of Q (\u223c100) were obtained for the Mesozoic and Cenozoic sedimentary rocks of the Peter I Range compared with those in the crystalline rock of the South Tien Shan (Q \u2273 500). For events with the same low frequency spectra, earthquakes in the South Tien Shan are recorded with more energy at higher frequencies than earthquakes in the Peter I Range, at least in part, because of the greater attenuation of the sedimentary rock in the latter region. There is a wide variety of spectra radiated by earthquakes throughout the Garm region, but a marked difference between spectra radiated by earthquakes from these two regions is not apparent. Nevertheless although calculated stress drops of earthquakes appear to vary considerably throughout the region, there appears to be a dependence on the type of rock in which the earthquakes occurred. The variation in calculated stress drops, however, is greater within either region than between the two. For most regions and for most of the range of seismic moments studied the shape of the spectrum is relatively independent of seismic moment. Consequently, calculated stress drops increase with seismic moment, with the functional dependence varying from region to region. For the largest events, the spectrum shifts to lower frequencies with increasing moment and stress drops become essentially independent of moment. Preliminary results suggest that the stress drops are not detectably different for earthquakes with thrust or normal faulting fault-plane solutions. A limited amount of data are consistent with a change in spectral content and stress drop of earthquakes in the vicinity of and before stronger earthquakes but a clear, consistent pattern is not yet evident. Toward high frequencies, S-wave spectra both begin to decrease at lower frequencies and seem to decrease more rapidly than P-wave spectra, in contrast with predictions of published dislocation models of earthquakes.<\/jats:p>","DOI":"10.1785\/bssa0680040949","type":"journal-article","created":{"date-parts":[[2021,9,22]],"date-time":"2021-09-22T19:02:11Z","timestamp":1632337331000},"page":"949-971","source":"Crossref","is-referenced-by-count":75,"title":["Preliminary analysis of the spectral content of <i>P<\/i> and <i>S<\/i> waves from local earthquakes in the Garm, Tadjikistan region"],"prefix":"10.1785","volume":"68","author":[{"given":"T. G.","family":"Rautian","sequence":"first","affiliation":[{"name":"Institute of Physics of the Earth Academy of Sciences of the USSR B. Gruzinskaya 10 Moscow, D242 USSR"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V. I.","family":"Khalturin","sequence":"additional","affiliation":[{"name":"Institute of Physics of the Earth Academy of Sciences of the USSR B. Gruzinskaya 10 Moscow, D242 USSR"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V. G.","family":"Martynov","sequence":"additional","affiliation":[{"name":"Institute of Physics of the Earth Academy of Sciences of the USSR B. Gruzinskaya 10 Moscow, D242 USSR"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P.","family":"Molnar","sequence":"additional","affiliation":[{"name":"Department of Earth & Planetary Sciences Massachusetts Institute of Technology Cambridge, Massachusetts 02139"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"790","published-online":{"date-parts":[[1978,8,1]]},"reference":[{"key":"2021092217513072100_BIB1","doi-asserted-by":"crossref","first-page":"3322","DOI":"10.1029\/JB080i023p03322","article-title":"Origin of coda waves: Source, attenuation and scattering effects","volume":"80","author":"Aki","year":"(1975)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB2","doi-asserted-by":"crossref","first-page":"4997","DOI":"10.1029\/JB075i026p04997","article-title":"Tectonic stress and the spectra of seismic shear waves from earthquakes","volume":"75","author":"Brune","year":"(1970)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB3","doi-asserted-by":"crossref","first-page":"3639","DOI":"10.1029\/JZ072i014p03639","article-title":"Frictional characteristics of granite under high confining pressure","volume":"72","author":"Byerlee","year":"(1967)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB4","doi-asserted-by":"crossref","first-page":"6031","DOI":"10.1029\/JB073i018p06031","article-title":"Stick slip, stable sliding, and earthquakes\u2014effect of rock type, pressure, strain rate, and stiffness","volume":"73","author":"Byerlee","year":"(1968)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB5","first-page":"49","article-title":"Regional variation of the scaling law of earthquake source spectra","volume":"68","author":"Chouet","year":"(1978)","journal-title":"Bull. Seism. Soc. Am."},{"key":"2021092217513072100_BIB6","unstructured":"Clark\n            M. M.\n          \n          (1972).\nSurface rupture along the Coyote Creek Fault, in\nThe Borrego Mountain Earthquake of April 9, 1968,\nGeol. Surv.Profess. Paper 787,\n55-\n86."},{"key":"2021092217513072100_BIB7","first-page":"117","article-title":"Present surface movements in the Surkhob Fault Zone","author":"Finko","year":"(1971)","journal-title":"Geotectonics (5)"},{"key":"2021092217513072100_BIB8","volume-title":"Regularities of Seismic Effects in the Territory of Tadjikistan","author":"Gubin","year":"(1960)"},{"key":"2021092217513072100_BIB9","volume-title":"Lecture Notes on basin problems in seismotectonics","author":"Gubin","year":"(1967)"},{"issue":"(176)","key":"2021092217513072100_BIB10","first-page":"247","article-title":"History of geological development and present structure of the Garm region","volume":"No. 9","author":"Gzovsky","year":"(1960)","journal-title":"Methods of Detailed Study of Seismicity, ch. 8, Trudy Inst. Phys. Earth"},{"key":"2021092217513072100_BIB11","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1146\/annurev.ea.01.050173.001241","article-title":"Mode of strain release associated with major earthquakes in Japan","volume":"1","author":"Kanamori","year":"(1973)","journal-title":"Annual Reviews of the Earth Science"},{"key":"2021092217513072100_BIB12","first-page":"1073","article-title":"Theoretical basis of some empirical relations in seismology","volume":"65","author":"Kanamori","year":"(1975)","journal-title":"Bull. Seism. Soc. Am."},{"issue":"(176)","key":"2021092217513072100_BIB13","first-page":"163","article-title":"Foci of earthquakes","volume":"No. 9","author":"Keilis-Borok","year":"(1960)","journal-title":"Methods of Detailed Study of Seismicity, ch. 6, Trudy Inst. Earth Phys."},{"key":"2021092217513072100_BIB14","first-page":"125","article-title":"Attenuation of seismic waves in the earth's crust of the North Tien Shan","author":"Khalturin","year":"(1971)","journal-title":"Experimental Seismology"},{"issue":"(192)","key":"2021092217513072100_BIB15","first-page":"101","article-title":"Evaluation of attenuation of longitudinal and transverse waves in the earth's crust by observations of local earthquakes","volume":"No. 25","author":"Khalturin","year":"(1962)","journal-title":"Trudy Inst. Earth Phys."},{"key":"2021092217513072100_BIB16","doi-asserted-by":"crossref","first-page":"2931","DOI":"10.1029\/JB082i020p02931","article-title":"The spectral content of the Pamir-Hindu Kush intermediate depth earthquakes: Evidence for a high-Q zone in the upper mantle","volume":"82","author":"Khalturin","year":"(1977)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB17","first-page":"71","article-title":"Study of movement of the earth's crust in the experimental polyon near Garm","volume":"No6","author":"Konopaltsev","year":"(1970)","journal-title":"Izvestiya Acad. Sci. USSR Earth Phys."},{"key":"2021092217513072100_BIB18","doi-asserted-by":"crossref","first-page":"5731","DOI":"10.1029\/JB077i029p05731","article-title":"Earthquake fault parameters and tectonics in Africa","volume":"77","author":"Maasha","year":"(1972)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB19","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1785\/BSSA0660030639","article-title":"Dynamics of an expanding circular fault","volume":"66","author":"Madariaga","year":"(1976)","journal-title":"Bull. Seism. Soc. Am."},{"key":"2021092217513072100_BIB20","first-page":"96","article-title":"Preliminary results of an investigation of spectra of earthquakes in the Garm region in light of problems of the prediction of strong earthquakes","volume":"1","author":"Martynov","year":"(1976)","journal-title":"Sbornik of Soviet-American Workon the Prediction of Earthquakes, vol. 1, Book"},{"key":"2021092217513072100_BIB21","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1016\/0031-9201(72)90010-6","article-title":"Moments, source dimensions and stress drops of shallow-focus earthquakes in the Tonga-Kermadec Arc","volume":"6","author":"Molnar","year":"(1972)","journal-title":"Phys. Earth Planet Interiors"},{"key":"2021092217513072100_BIB22","doi-asserted-by":"crossref","first-page":"2091","DOI":"10.1785\/BSSA0636-12091","article-title":"Corner frequencies of P and S waves and models of earthquake sources","volume":"63","author":"Molnar","year":"(1973)","journal-title":"Bull. Seism. Soc. Am."},{"key":"2021092217513072100_BIB23","first-page":"159","article-title":"Influences of the propagation path of waves and of the place of recording on ChISS spectra of local earthquakes of the Garm region","volume":"1","author":"Molnar","year":"(1976)","journal-title":"Sbornik of Soviet-American Work on the Prediction of Earthquakes, vol. 1, Book"},{"issue":"(176)","key":"2021092217513072100_BIB24","first-page":"30","article-title":"Structure of the earth's crust and methods of processing of seismic data","volume":"No. 9","author":"Nersesov","year":"(1960)","journal-title":"Methods of Detailed Study of Seismicity, ch. 3, Trudy Inst. Phys. Earth"},{"key":"2021092217513072100_BIB25","first-page":"137","article-title":"Seismic regionalization of the Garm region from the ratio of velocities of body waves","author":"Nersesov","year":"(1969)","journal-title":"Seismic Regime"},{"key":"2021092217513072100_BIB26","first-page":"334","article-title":"Space-time distribution of ratios of travel times of transverse and longitudinal waves in the Garm region","author":"Nersesov","year":"(1971)","journal-title":"Experimental Seismology"},{"issue":"(199)","key":"2021092217513072100_BIB27","first-page":"88","article-title":"About the determination of energy of earthquakes at distances up to 3,000 km","volume":"No. 32","author":"Rautian","year":"(1965)","journal-title":"Trudy Inst. Earth Phys."},{"key":"2021092217513072100_BIB28","first-page":"566","article-title":"Spectral structure of the coda of local earthquakes as an instrument for investigation of focal radiation","volume":"226","author":"Rautian","year":"(1976)","journal-title":"Doklady"},{"key":"2021092217513072100_BIB29","doi-asserted-by":"crossref","first-page":"923","DOI":"10.1785\/BSSA0680040923","article-title":"The use of the coda for determination of the earthquake source spectrum","volume":"68","author":"Rautian","year":"(1978)","journal-title":"Bull. Seism. Soc. Am."},{"key":"2021092217513072100_BIB30","doi-asserted-by":"crossref","first-page":"1549","DOI":"10.1029\/JB077i008p01549","article-title":"Regional variations of seismic source parameters in the Northern Baja, California Area","volume":"77","author":"Thatcher","year":"(1972)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB31","doi-asserted-by":"crossref","first-page":"8547","DOI":"10.1029\/JB078i035p08547","article-title":"Source parameters of Southern California earthquakes","volume":"78","author":"Thatcher","year":"(1973)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB32","first-page":"613","article-title":"Regional variations of P-wave spectra (1)","volume":"47","author":"Tsujiura","year":"(1969)","journal-title":"Bull. Earthquake Res. Inst., Tokyo Univ."},{"key":"2021092217513072100_BIB33","first-page":"69","article-title":"Seismograms, S-wave spectra and source parameters for aftershocks of the San Fernando earthquake","volume":"Vol. III","author":"Tucker","year":"(1973)","journal-title":"San Fernando, California Earthquake of February 9, 1971"},{"key":"2021092217513072100_BIB34","doi-asserted-by":"crossref","first-page":"2716","DOI":"10.1029\/JB076i011p02716","article-title":"Comparison of P-wave spectra of underground nuclear explosions and earthquakes","volume":"76","author":"Wyss","year":"(1971)","journal-title":"J. Geophys. Res."},{"key":"2021092217513072100_BIB35","doi-asserted-by":"crossref","first-page":"1153","DOI":"10.1785\/BSSA0610051153","article-title":"Regional variations of source properties in Southern California estimated from the ratio of long to short period amplitudes","volume":"61","author":"Wyss","year":"(1971)","journal-title":"Bull. Seism. Soc. Am."},{"key":"2021092217513072100_BIB36","first-page":"153","article-title":"Measurements of the level and spectral composition of short period microseisms","volume":"10","author":"Zapolski","year":"(1960)","journal-title":"Trudy Inst. Phys. Earth. Akad. Sci. USSR"},{"key":"2021092217513072100_BIB37","first-page":"20","article-title":"The frequency selective seismograph station ChISS","author":"Zapolski","year":"(1971)","journal-title":"Experimental Seismology"},{"issue":"(1976)","key":"2021092217513072100_BIB38","first-page":"115","article-title":"Frequencies of seismic oscillations","volume":"No. 9","author":"Zapolski","year":"(1960)","journal-title":"Methods of Detailed Study of Seismicity, ch. 5, Trudy Inst. Earth Phys."},{"issue":"(192)","key":"2021092217513072100_BIB39","first-page":"77","article-title":"Comparison of average spectra at different stations for deep and shallow earthquakes with data (ChISS)","volume":"No. 25","author":"Zhigaltsev","year":"(1962)","journal-title":"Trudy Inst. Phys. Earth"}],"container-title":["Bulletin of the Seismological Society of America"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/pubs.geoscienceworld.org\/ssa\/bssa\/article-pdf\/68\/4\/949\/5321295\/bssa0680040949.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"http:\/\/pubs.geoscienceworld.org\/ssa\/bssa\/article-pdf\/68\/4\/949\/5321295\/bssa0680040949.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,9,22]],"date-time":"2021-09-22T19:02:51Z","timestamp":1632337371000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.geoscienceworld.org\/bssa\/article\/68\/4\/949\/117796\/Preliminary-analysis-of-the-spectral-content-of-P"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1978,8,1]]},"references-count":39,"journal-issue":{"issue":"4","published-online":{"date-parts":[[1978,8,1]]},"published-print":{"date-parts":[[1978,8,1]]}},"URL":"https:\/\/doi.org\/10.1785\/bssa0680040949","relation":{},"ISSN":["1943-3573","0037-1106"],"issn-type":[{"value":"1943-3573","type":"electronic"},{"value":"0037-1106","type":"print"}],"subject":[],"published-other":{"date-parts":[[1978,8]]},"published":{"date-parts":[[1978,8,1]]}}}