Magnitudes of great shallow earthquakes from 1953 to 1977

Abe, Katsuyuki; Kanamori, Hiroo

doi:10.1016/0040-1951(80)90192-4

Cited by 58 publications

(15 citation statements)

References 19 publications

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“…Combining this with the revised relation between mB and Ms, i.e., mB=0.65Ms +2.5 (ABE and KANAMORI, 1980;ABE, 1981), we obtain Ms=(logM0-15.6)/1.56. logM0 indicating that the apparent stress is, on the average, nearly constant.…”

Section: Discussionmentioning

confidence: 91%

“…For shallow events, the surface-wave magnitude Ms has been habitually used as a standard scale. In order to maintain the consistency as much as possible, here we examine the relation for shallow events on the basis of the mB scale; because the magnitude versus energy relation was originally introduced on the basis of the mB scale (GUTENBERG and RICHTER, 1956), and the mB versus Ms relation is debatable (ABE and KANAMORI, 1980;ABE, 1981). Using the same method as that employed before, we assigned mB to the data set given by KANAMORI and ANDERSON (1975).…”

Section: Discussionmentioning

confidence: 99%

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Magnitude, seismic moment and apparent stress for major deep earthquakes.

Abe

1982

J,Phys,Earth

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On the basis of an extensive data-set of major deep and intermediate-depth earthquakes, the relation between body-wave magnitude mB and seismic moment M0 is discussed in terms of apparent stress. mB is determined from amplitudes and periods of P, PP and S waves recorded by broad-band instruments, and is therefore suitable for measuring the overall size of major earthquakes. The relation between mB and logM0 is approximately linear for the data set of mB greater than 6. This indicates that the apparent stress is, on the average, nearly constant. A gross average of 60 bar is obtained for the earthquakes over a large depth range. For a simple fault model, we have parent stress implies a decrease of seismic efficiency with an increase of depth. A very similar relation between mB and logM0 is applicable to large shallow earthquakes.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Magnitude, seismic moment and apparent stress for major deep earthquakes.

Abe

1982

J,Phys,Earth

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“…The magnitude of many large earthquakes used in the calculations of Davies and Brune [ 1971] had been overestimated [Geller and Kanamori, 1977;Geller et al, 1978;Abe and Kanamori, 1980;Kanamori and Abe, 1979;Abe, 1979], and several (18) earthquakes were missing from their catalog [Miyamura, 1976]. We have recompiled the catalog of large (Ms >-7.0) shallow (h <_ 60 km) earthquakes since 1898 [McNally and Hearn, 1981] for closer examination of the seismic slip rates and for a comparison with the plate convergence rates [Minster and Jordan, 1978].…”

Section: Catalogued Seismicitymentioning

confidence: 99%

Nonuniform seismic slip rates along the Middle America Trench

McNally¹,

Minster²

1981

J. Geophys. Res.

113

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Revised estimates of seismic slip rates along the Middle America Trench are lower on the average than plate convergence rates but match them locally (for example, Oaxaca). Along the Cocos‐North American plate boundary this can be explained by nonuniformities in slip at points of aseismic ridge or fracture zone subduction. For at least 81 yr (and possibly several hundred years), no major (Ms ≥ 7.5) shallow earthquake is known to have occurred near the Orozco Fracture Zone and Tehuantepec Ridge areas. Compared with the average recurrence periods for large earthquakes (33 ± 8 yr since 1898 and 35 ± 24 yr between 1542 and 1979), this suggests that either a large (M ≥ 8.4) event may be anticipated at such locations, or that these are points of aseismic subduction. Large coastal terraces and evidence suggesting tectonic uplift are found onshore near the Orozco Fracture zone. The larger discrepancy between plate convergence and seismic slip rates along the Cocos‐Carribbean plate boundary is more likely due to decoupling and downbending of the subducted plate. We used the limited statistical evidence available to characterize both spatial and temporal deficiencies in recent seismic slip. The observations appear consistent with a possible forthcoming episode of more intense seismic activity. Based on a series of comparisons with carefully delineated aftershock zones, we conclude that the zones of anomalous seismic activity can be identified by a systematic, automated analysis of the worldwide earthquake catalog (mb ≥ 4).

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“…For these large events, MR is significantly larger than m• (e.g., for m• = 7.9, MR = 8.5). Abe and Kanamori [1979].) In the present study we used m• defined by (3).…”

Section: Introductionmentioning

confidence: 99%

“…In the present study we used m• defined by (3). The method of calculation is described in detail in Abe and Kanamori [1979] and is not repeated here.…”

Section: Introductionmentioning

confidence: 99%