The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes
Abstract—Average envelope shapes (mean square amplitude time histories) of small earthquakes represent a convenient basis for the construction of semi-empirical stochastic ‘‘Green’s functions,’ ’ needed for prediction of future strong ground motion. At the same time, they provide crucial evidence fo...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.2945 http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.599.2945 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.599.2945 2023-05-15T16:58:48+02:00 The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes A. G. Petukhin A. A. Gusev The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.2945 http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.2945 http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf Key words Scattering duration envelope Kamchatka text ftciteseerx 2016-01-08T13:53:05Z Abstract—Average envelope shapes (mean square amplitude time histories) of small earthquakes represent a convenient basis for the construction of semi-empirical stochastic ‘‘Green’s functions,’ ’ needed for prediction of future strong ground motion. At the same time, they provide crucial evidence for verification of the theories of scattering of high-frequency seismic waves in the lithosphere. To determine such shapes in the Kamchatka region we use the records of near (R = 50–200 km) shallow earthquakes located around the broadband station PET. On these records, we select the S-wave group and determine its root-mean-square duration Trms, separately for each of the five octave frequency bands. We determine the empirical Trms vs. distance dependence and find it to be very close to a linear one. At the reference distance R = 100 km, average Trms decreases from 5.4 sec for the 0.75 Hz band to 3.9 sec for the 12 Hz band. To analyze average envelopes, we assume that the functional form of the envelope shape function is independent of distance, and stretch each of the observed envelopes along the time axis so as to reduce it to a fixed distance. Through averaging of these envelopes we obtain characteristic envelope shape functions. We qualitatively analyze these shapes and find that around the peak they are close to the shapes expected for a medium with power-law inhomogeneity spectrum, with the spectral exponent 3.5–4. From onset-to-peak delay times we derive the values of transport mean free path and of scattering Q for a set of distances. Text Kamchatka Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words Scattering duration envelope Kamchatka |
spellingShingle |
Key words Scattering duration envelope Kamchatka A. G. Petukhin A. A. Gusev The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
topic_facet |
Key words Scattering duration envelope Kamchatka |
description |
Abstract—Average envelope shapes (mean square amplitude time histories) of small earthquakes represent a convenient basis for the construction of semi-empirical stochastic ‘‘Green’s functions,’ ’ needed for prediction of future strong ground motion. At the same time, they provide crucial evidence for verification of the theories of scattering of high-frequency seismic waves in the lithosphere. To determine such shapes in the Kamchatka region we use the records of near (R = 50–200 km) shallow earthquakes located around the broadband station PET. On these records, we select the S-wave group and determine its root-mean-square duration Trms, separately for each of the five octave frequency bands. We determine the empirical Trms vs. distance dependence and find it to be very close to a linear one. At the reference distance R = 100 km, average Trms decreases from 5.4 sec for the 0.75 Hz band to 3.9 sec for the 12 Hz band. To analyze average envelopes, we assume that the functional form of the envelope shape function is independent of distance, and stretch each of the observed envelopes along the time axis so as to reduce it to a fixed distance. Through averaging of these envelopes we obtain characteristic envelope shape functions. We qualitatively analyze these shapes and find that around the peak they are close to the shapes expected for a medium with power-law inhomogeneity spectrum, with the spectral exponent 3.5–4. From onset-to-peak delay times we derive the values of transport mean free path and of scattering Q for a set of distances. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. G. Petukhin A. A. Gusev |
author_facet |
A. G. Petukhin A. A. Gusev |
author_sort |
A. G. Petukhin |
title |
The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
title_short |
The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
title_full |
The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
title_fullStr |
The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
title_full_unstemmed |
The Duration-distance relationship and average envelope shapes of small Kamchatka earthquakes |
title_sort |
duration-distance relationship and average envelope shapes of small kamchatka earthquakes |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.2945 http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.599.2945 http://www.kscnet.ru/ivs/bibl/sotrudn/stgusev/2003_envel[1].pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766050908017262592 |