Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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100 S. Stein, E. A. Okal and D. A. Wiensseismicity. One such case is the Gulf of Mexico; the small earthquakes in the areacan be interpreted as a consequence of the rapid sediment loading history (Nunn,1985).As with the Indian Ocean deformation, the primary evidence for the importanceof passive margin seismicity comes from the historical earthquakes. The recent seismicityis adequate to confirm its existence, but too small to convincingly demonstratethe magnitude of the effect.4.3. Seismicity Patterns an the Eastern Part of the Pacific PlateThe easternmost part of the Pacific plate, generated at the fast-spreading EastPacific Rise in the past 20 Ma, has been the site of occasional yet intense seismicactivity (see Figure 11). This seismicity is well documented by the post-WWSSNdata, but only the historical earthquakes show its true dimension. As shown onFigure 11, 8 events reached or exceeded magnitude 6 between 1937 and 1962. Thepreferential location of these events in the young oceanic lithosphere is consistentwith the observation that the rate of oceanic intraplate seismicity decreases withincreasing lithospheric age (Wiens and Stein, 1983). A full study of these events isgiven by Okal (1984) and Okal and Wiens (1985).At the southernmost epicenter, the 1947 earthquake (see Figure I), the additionalshock in 1950, and the probable location of the major 1949 event in its immediatevicinity, clearly reveal the area as one of preferential intraplate seismicity. The factthat the 1947 shock has a thrust faulting mechanism, as opposed to the normalfaulting of a smaller event in 1976, some 200 km northwest, is a superb exampleof the complex regime of tectonic stress in the youngest portions of oceanic plates(Wiens and Stein, 1984; Bergman and Solomon, 1984). Once again, the historicaldata rules out the simplest explanation - in this case, that the lithosphere wouldbe in a state of extension in the direction perpendicular to the ridge.The 1955 earthquake at 25"S, 12ZoW, is a rare case of a large normal faultingearthquake on the flanks of a major seamount. Its similarities with shocks followingdocumented episodes of volcanic activity suggests that the seamount may still bemagmatic ally active.Finally, the 1945 event further north and the recent (1984) swarm at 20"N,116'W, further identify the fringe of the Pacific plate along the northern portionof the East Pacific Rise as a region of enhanced seismicity, particularly at the levelof magnitude 6 or greater. This is in contrast to the bulk of the plate (the "F"region in Figure 11), where no magnitude 6 events are known outside of Hawaii.Okal (1984) has proposed to interpret this intriguing pattern in the frameworkof the reorientation which accompanied the Miocene ridge jump in the EasternPacific, and resulting in a geometry of particular vulnerability in relation to theintraplate tectonic stress. This picture could not have evolved without the crucialdata provided by the historical earthquakes: Figure 11 shows only one event withMs > 6 recorded inside the Pacific plate (Hawaii excepted) during the first 19 yearsof the WWSSN.
Application of Modern Techniques to Analysis of Historical Earthquakes 101Figure 11. Map of Pacific intraplate earthquakes with at least one confirmed magnitude> 6 (after Okal (1984)). Stars are historical events, dots epicenters known frompost-WWSSN seismicity. This map identifies portions of the Pacific plate generated atvarious spreading ridges (see Okal (1984) for details). Note that magnitude 6 or greaterseismicity is common outside Region “F”, generated at the Farallon ridge, but that post-WWSSN seismicity gives a very incomplete picture.ACKNOWLEDGEMENTSThis research was supported by the National Science Foundation under GrantEAR-84-07510, the Office of Naval Research under Contract N-00014-84-C-0616,and Research Initiation Funds at Washington University. We thank the referencestaff of the Evanston Public Library for explaining the proper usage of “historic”and “historical”.REFERENCESArtyushkov, E. V. (1973). Stresses in the lithosphere caused by crustal thickness inhomogeneities,J. Geophys. Res., 78, 7675-7708.Bergman, E. A. and S. C. Solomon (1984). Source Mechanisms of Earthquakes near Midoceanicridges from body waveform inversion: implications for early evolution ofoceanic lithosphere, J. Geophys. Res., 89, 11415-11441.
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Historical SeismogramsandEarthquake
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ToJames F. Landerfor his leadership
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viContentsThe Status, Importance, a
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...VlllEarthquake History of Califo
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XMicrofilming of Historical Seismog
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PrefaceA symposium on Historical Se
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I. Introduction
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4 W. H. K. Lee, H. Meyers, and K. S
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6 W. H. K. Lee, H. Meyers, and K. S
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8 W. H. h‘. Lee, H. Meyers, and K
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10 W. H. K. Lee, IT. Meyers, and K.
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12 W. H. K. Lee, H. Meyers, and K.
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14 W. H. K. Lee, H. Meyers, and K.
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IMPORTANCE OF HISTORICAL SEISMOGRAM
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18 Hiroo KanamoriTable Ib. Some Lar
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-60'1 1904-1985-M, >8.01II\I'.iPlus
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22 Hiroo Kanamorievents often have
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~~~24 Hiroo KanamoriThatcher et al.
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26 Hiroo Kanamo riIf relatively com
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28 Hiroo Kanamori9. Difficulties in
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30 Hiroo KanamoriNagamune, T. (1971
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32 Hiroo KanamoriI I I I I1000100z
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11. Analysis of Historical Seismogr
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38 Kat su y uki A beaddition to thi
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42 Katsuyuki Abe20:oow19:302-I--Ia
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44 Katsuyuki AbeIn the present stud
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46 Katsuyuki AbeTable 3. Sinkiang E
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~48 Katsuyuki AbeSieh (1978) and ot
Page 64 and 65: 50 Katsuyuki AbeREFERENCESAbe, K. (
Page 66 and 67: 52 E. Hurtig and G. KowalleFRG'.L.-
Page 68 and 69: 54 E. Hurtig and G. Kowalle2.2 Reco
Page 70 and 71: 56 E. Hurtig and G. KowalleREFERENC
Page 72 and 73: 58 N. V. Kondorskaya and Yu. F. Kop
Page 78 and 79: THE STATUS, IMPORTANCE, AND USE OFH
Page 80 and 81: 66 Ota Kulhdnek1 8 35lo. r 1s ' 20
Page 82 and 83: 68 Ota Kulhdnek1 UPP EW SEP 9 1954
Page 84 and 85: ANALYSIS OF HISTORICAL SEISMOGRAMS
Page 86 and 87: 72 S. K. Singhfrom Uppsala. We also
Page 88 and 89: 74S. K. SinghN1 1Oaxaca-X .-x x- x
Page 90 and 91: 76S. K. SinghESKUPPWIECHERT ELPZ A-
Page 92 and 93: 78 S. K. SinghJdFJ-22 Feb 1943Ms=7.
Page 94 and 95: 80 S. K. SinghDE BlLT (DBN) Z$I = 3
Page 96 and 97: 82 S. K. Singh7. The Great Jalisco,
Page 98 and 99: 84 S. K. SinghREFERENCESAbe, K. (19
Page 100 and 101: 86 S. Stein, E. A. Okal and D. A. W
Page 108 and 109: 94S. Stein, E. A. Okal and D. A. Wi
Page 110 and 111: 96S. Stein, E. A. Okal and D. A. Wi
Page 116 and 117: 102 S. Stein, E. A. Okal and D. A.
Page 118 and 119: 104 S. Stein, E. A. Okal and D. A.
Page 121 and 122: RECENT ACTIVITIES AT THE INTERNATIO
Page 123 and 124: S.S. Felt and Damaging EarthquakesI
Page 125 and 126: In t e r na tio n a1 Se is mo logic
Page 127 and 128: 1. IntroductionCatalogue of Chinese
Page 129 and 130: Catalogue of Chinese Earthquakes (M
Page 135 and 136: Catalogue of Chinese Earthquakes (A
Page 139 and 140: Catalogue of Chinese Earthquakes (A
Page 145 and 146: DATA BASES ON HISTORICAL SEISMICITY
Page 147 and 148: Data Bases on Historical Seismicity
Page 153 and 154: COMPILATION AND PROCESSING OF HISTO
Page 155 and 156: Compilation and Processing of Histo
Page 157 and 158: The U. S. Geological Survey’s Dat
Page 159 and 160: The U. S. Geological Survey's Datab
Page 161 and 162: ~ ~The U. 5‘. Geological Survey
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Catalog of Large and Damaging Earth
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YCatalog of Large and Damaging Eart
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YM D h m1918 2 9 20 461918 2 13 6 7
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His to ric al Mate ria Is of Chine
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Historic a1 Mate rials of Chinese E
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Historical Materials of Chinere Ear
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His t o r ical Mate rials of Chin e
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IV. Individual Historical Earthquak
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174 N. N. Ambraseys and C. F. Finke
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182 N. N. Arnbraseys and C. P. Melv
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184 N. N. Ambraseys and C. P. Melvi
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188 N. N. Arnbraseys and C. P. Melv
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202G. E. Fiedler B.FI1 IFigure 1. T
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204 G. E. Fiedler B.Figure 3. The S
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206 G. E. Fiedler B.Origin time Epi
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EVALUATION OF DAMAGE AND SOURCE PAR
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2 10 D. Muiioz and A. Udias3. Evalu
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212 D. Muiioz and A. Udias3 wFigure
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2 14 D. Mun"oz and A. Udiasgiven by
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216 D. Muioz and A. UdiasTable 2. D
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218 D. Munot and A. UdiasGentil, P.
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220 D. Muiioz and A. UdiasArchivo M
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V. Earthquake History
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226 M. DeBecker and T. CamelbeeckAt
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~~228 M. DeBecker and T. Camelbeeck
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230 M. DeBecker and T. Camelbeeek10
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DOCUMENTING NEW ZEALAND EARTHQUAKES
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234 G. A. EabyFrom a seismic point
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236 G. A. EibyImmediate practical p
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238 G. A. Eibynorth-west; but subsi
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240 G. A. Eibywith near-earthquake
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242 Pao Hua Lee120 121 122 123Figur
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0.3244 Pao Hua Lee(3) Ryukyu-Taiwan
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Pa0 Hua LeeTable 2. Major Earthquak
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248 Pao Hua LeeTable 2. (Continued
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250 Pao Hua Lee‘. . . an earthqua
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252 Pao Hua LeeREFERENCESCentral We
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254 S. Prac h ua b21I151 O0IFigure
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256 S. PrachuabTable 1. 12 Seismic
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258 S. Prac h u a bTable 2. (Contin
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260S. Prachuab94" 96" 98" 1 ooo2ac2
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262 S. Prachuab.17 MAY 1955EMrliCUA
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:;13264 S. Prachuab0 .me.0 . .eeee0
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266 S. Prac hua b005 6 7MAGNITUDEFi
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268 T. R. Toppozada, C. R. Real, an
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2 72 T. R. Toppozada, C. R. Real, a
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STUDY OF HISTORICAL EARTHQUAKES IN
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278 Tatsuo Usarni(3) Documents publ
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280 Tatsuo Usarnin5nlob0D KyotoKama
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282 Tatsuo Usami:.:.., ........ L,/
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284 Tatsuo Usami(2) A tsunami attac
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286 Tatsuo Usami1897lntenrLFigure 6
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~ ~~~~288 Tatsuo UsamiTable 4. Occu
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290 R. G. Valenzuela and L. C. Garc
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n09n08n001NoZlNobIn091n081N 002
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~ ~~294 R. G. Valenzuela and L. C.
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296 R. G. Valenzuela and L. C. Garc
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298 R. Muir Wood, G. Woo, and H. Bu
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MAGNITUDE-FAULT LENGTH RELATIONSHIP
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APPLICATIONS OF FUZZY MATHEMATICSIN
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Applications of Fuzzy Mathematics 3
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Applications of Fuzzy hluthematics
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ON THE SEISMICITY OF THE MIDDLEASTS
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uca,m a,kma,.IY kfi30 uhd
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On the Seismicity of the Middle Eas
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On the Seismicity oj the Middle Eas
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HISTORICAL SEISMICITY AND EARTHQUAK
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Historical Seismic it y and Earthqu
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fIistorica1 Seismicity and Earthquu
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Historical Seismicity and Earthquak
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PATTERN ANALYSIS OF SMALL EARTHQUAK
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Pattern Analysis of Small Earthquak
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Earthquakes and Deep Fracture Zones
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--_-Earthquakes and Deep Fracture Z
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HISTORICAL SEISMOGRAM FILMING PROJE
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~~Historical Seismogram Filming Pro
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Historical Seismogram Filming Proje
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Historical Seismogram Filming Proje
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Filming Seismograms and Related Mat
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Digitization and Processing of J.M.
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SOME REMARKS ON HISTORICAL SEISMOGR
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Historical Seismograms and the Micr
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~~~~Historical Seismograms and the
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His torical Se is mogru ms and the
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Historical Sezs mogra ms and the Ma
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H1s t o rical Seismograms a nd the
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Historical Seismograms in China 42
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424 Kezin Qua History of Chinese Se
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428 Kexin Qu8. Plans for the Near F
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430 0. Ye. Starovoita station, its
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DAT ANDTHE STANDARDIZATION OF SEISM
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434 Y. Tamura, H. Sasaki, M. Ooe, a
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~ So.i436 Y. Tarnura, H. Sasaki, M.
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438 Y. Tarnura, H. Sasaki, M. Ooe,
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440 Yasuhiro Umeda and Katsuyoshi I
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442 Yasuhiro Umeda and Katsuyoshi I
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HISTORICAL SEISMOGRAMS IN ITALYR. C
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Historical Seismograms in Italy 449
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HISTORICAL SEISMOGRAMS FROM AUSTRAL
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His to rical Se is mog ra ms From A
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SEISMOGRAMS MADE BEFORE 1963 AT STA
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2. New ZealandSeismograms Before 19
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Seismograms Before 1963 in the Sout
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Seismograms Before 1963 in the Sout
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Historical Seismograms Recorded in
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Hist orieal Se is mograms Reeo rded
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THE HISTORICAL SEISMOGRAMS OF COLOM
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The Historical Seismograms of Colom
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Helwan Historical Seismograms 475Al
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Se is mo log ic a1 Mea s use me n t
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Seismological Measurement an Hong K
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A BRIEF HISTORY OF THE SEISMOLOGICA
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History of the Seismological Observ
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~~ ~ ~ ~~ ~ ~~Historical Seismogram
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494 Sergio S. Su, S. J.Figure S. Se
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496 Sergao S. Su, S. J.Figure 7. Ce
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498 K. L. SuendsenDominican Republi
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INDEXAAbuyama Seismological Observa
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Index 503China, see also Taiwan466
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Indez505HIHalin seismograph, 421Haw
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Index 507Karuizawa, 417Kobe, 117, 1
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Index 509PPacific Ocean1943 Malpelo
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Index 511Sri Lanka, Colombo station
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Index 513Wood-Anderson seismographW
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