Tables of extended distances for PKP and PcP

Hodgson, John H.; Allen, J F J

doi:10.4095/311138

Cited by 6 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was estimated by construction of a fault plane solution from analysis of P , PKP, aild 5' wave polarizations of the long-period (20 s) WWSS film chip records. The extended distance tables of Hodgson & Storey (1953) and Hodgson & Allen (1954) were used. Fig.…”

Section: Datamentioning

confidence: 99%

Stacking and Stripping for Normal Mode Eigenfrequencies

Nyman¹

1975

Geophysical Journal International

View full text Add to dashboard Cite

A method suggested by Gilbert to identify individual normal mode (singlet) eigenfrequencies has been applied to a set of broadband accelerometer data, representing twenty-seven events recorded at a single location. Although the data set was found inadequate to allow the identification of any singlet eigenfrequencies, a slight modification to Gilbert's method yielded a procedure to estimate normal mode multiplet centre or average frequencies, and to separate closely-spaced multiplets. The results reported here, for ' source stacking ', are in general agreement with other's results for ' receiver stacking '. Finally, a feasibility study indicates the quantity/quality of data necessary to resolve singlet eigenfrequencies.

show abstract

Section: Datamentioning

confidence: 99%

Stacking and Stripping for Normal Mode Eigenfrequencies

Nyman¹

1975

Geophysical Journal International

View full text Add to dashboard Cite

show abstract

Herdmechanische Vorgä‘nge bei einigen zirkumpazifischen Erdbeben

Mühlhäuser¹

1957

Tellus

View full text Add to dashboard Cite

Earthquake mechan'sms can be determined by a method given by P. Byerly and later developed by J. H. Hodgson and his collaborators. By a comparison with the tectonics of the earthquake region, it is possible in most cases to decide which of the two nodal planes represents the fault plane. As a certain arbitrariness cannot be avoided, also the stikes of the auxiliary planes have been given. If the arrows, indicating the direction of motion, have been drawn perpendicularly to the fault plane, this may mean that no auxiliary plane could be determined. The mechanisms have been determined for 11 earthquakes in the years 1931–1950 in the Pacific area. It results that there is no general rule for the mechanisms, although the strikes of the fault planes in general coincide with the Circum‐Pacific structural lines. The dip of the fault plane is as small as 31° in one case (earthquake no. 7), whereas the dip for the other cases is at least twice as large. Most of the earthquakes have a very large dip of the fault plane, in the range 70–88°. Dip values above 80° are especially frequent. The cases with smaller dip are localized to the north and northwest part of the Circum‐Pacific belt. The coastal earthquake belts of Central and South America exhibit a normal dip of the fault plane under the continent; this is also true for the northwest part of the Circum‐Pacific belt. The conditions are similar at the southeast coast of Kamchatka, in Alaska, in western part of the Aleutians, and in the area between the Loyalty Islands and New Hebrides. In the other cases the fault plane dips toward the Pacific. In northwestern Pacific belt the motions are often perpendicular to the strikes of the fault planes, whereas in the other areas the vertical motions are combined with horizontal displacements. The number of observations for a single earthquake varies between 22 and 47. A few earthquakes in the Alpide belt have also been investigated, and comparisons with the results of other authors (A. R. Ritsema, 1955; A. N. Tandon, 1955) showed good agreement in spite of the fact that these authors have used 4–5 times as many observations. In a particularly favourable case (Hindu Kush, Jan. 9, 1933), 14 reliable observations of the initial motion of P waves gave the same result as 7 times as many observations, used by Ritsema. Nevertheless, as many reliable observations as possible should be used for earthquake mechanism studies.

show abstract

Fault-plane solution for the Tango, Japan, earthquake of March 7, 1927*

Hodgson

1955

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

In an attempt to obtain confirmation of the fault-plane methods in use by the Dominion Observatory by comparison with an observed fault, a solution has been attempted for the Tango, Japan, earthquake of March 7, 1927. The direction of first motion was read from seismograms, accumulated for an earlier study by E. A. Hodgson, and filed at Ottawa. The data derived from the records are not sufficient to allow an independent solution that is very closely defined, but it is shown that they do satisfy the known strike, dip, and relative displacement very well.

show abstract

Tables of extended distances for PKP and PcP

Cited by 6 publications

References 0 publications

Stacking and Stripping for Normal Mode Eigenfrequencies

Stacking and Stripping for Normal Mode Eigenfrequencies

Herdmechanische Vorgä‘nge bei einigen zirkumpazifischen Erdbeben

Fault-plane solution for the Tango, Japan, earthquake of March 7, 1927*

Contact Info

Product

Resources

About