Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms.
The Alaskan-Aleutian arc has a history of rupturing in large and great earthquakes. The 20th century events include five great earthquakes: the 1938 Alaskan, 1946 Aleutian, 1957 Aleutian, 1964 Prince William Sound, and 1965 Rat Islands earthquakes. Due to the lack of seismic data for these earthquak...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/129701 2024-01-07T09:44:39+01:00 Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. Johnson, Jean Marie Satake, Kenji Ruff, Larry 1995 285 p. application/pdf https://hdl.handle.net/2027.42/129701 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9610154 English EN eng http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9610154 https://hdl.handle.net/2027.42/129701 Alaskan Aleutian Asperity Distribution Earthquakes Inversion Tsunami Waveforms Thesis 1995 ftumdeepblue 2023-12-10T17:57:31Z The Alaskan-Aleutian arc has a history of rupturing in large and great earthquakes. The 20th century events include five great earthquakes: the 1938 Alaskan, 1946 Aleutian, 1957 Aleutian, 1964 Prince William Sound, and 1965 Rat Islands earthquakes. Due to the lack of seismic data for these earthquakes, a technique to invert tsunami waveforms is used to determine the source parameters of the Alaskan-Aleutian earthquakes. From the study of the 1965 earthquake, the results of tsunami waveform inversion are shown to be compatible with results of seismic wave studies. The areas of highest slip correspond to the tectonic blocks of the western Aleutians. The rupture area, slip distribution and seismic moment of the 1957 earthquake have been determined. The Unalaska Island area did not rupture in the 1957 event, making this area a seismic gap. The moment magnitude M$\sb{\rm w}$ of this earthquake is 8.6, and the slip was concentrated in the western half of the aftershock zone. The 1938 earthquake did not rupture into the Shumagin Islands seismic gap. The slip in this earthquake was concentrated in the eastern third of the aftershock area. The 1946 earthquake is a very unusual seismic event, but the tsunami data can be modeled using a simple underthrusting mechanism. The slip was highest near the trench. The moment magnitude M$\sb{\rm w}$ is 8.3. Tsunami data alone cannot resolve the entire slip distribution of the 1964 earthquake. Joint inversion of tsunami and geodetic data gives the complete slip distribution. The highest slip occurred in Prince William Sound and in the Gulf of Alaska where the Yakutat terrane is being subducted. High slip also occurred in the Kodiak Island region. Large near-trench slip was a major source of the transPacific tsunami. Areas of high slip correspond to seismologically determined areas of high moment release. The factors controlling asperity size and location are variable. This work can be used as a basis for future hypothesis testing concerning future earthquakes, asperities and seismic ... Thesis Kodiak Yakutat Alaska University of Michigan: Deep Blue Gulf of Alaska Rat Islands ENVELOPE(178.303,178.303,51.788,51.788) |
institution |
Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Alaskan Aleutian Asperity Distribution Earthquakes Inversion Tsunami Waveforms |
spellingShingle |
Alaskan Aleutian Asperity Distribution Earthquakes Inversion Tsunami Waveforms Johnson, Jean Marie Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
topic_facet |
Alaskan Aleutian Asperity Distribution Earthquakes Inversion Tsunami Waveforms |
description |
The Alaskan-Aleutian arc has a history of rupturing in large and great earthquakes. The 20th century events include five great earthquakes: the 1938 Alaskan, 1946 Aleutian, 1957 Aleutian, 1964 Prince William Sound, and 1965 Rat Islands earthquakes. Due to the lack of seismic data for these earthquakes, a technique to invert tsunami waveforms is used to determine the source parameters of the Alaskan-Aleutian earthquakes. From the study of the 1965 earthquake, the results of tsunami waveform inversion are shown to be compatible with results of seismic wave studies. The areas of highest slip correspond to the tectonic blocks of the western Aleutians. The rupture area, slip distribution and seismic moment of the 1957 earthquake have been determined. The Unalaska Island area did not rupture in the 1957 event, making this area a seismic gap. The moment magnitude M$\sb{\rm w}$ of this earthquake is 8.6, and the slip was concentrated in the western half of the aftershock zone. The 1938 earthquake did not rupture into the Shumagin Islands seismic gap. The slip in this earthquake was concentrated in the eastern third of the aftershock area. The 1946 earthquake is a very unusual seismic event, but the tsunami data can be modeled using a simple underthrusting mechanism. The slip was highest near the trench. The moment magnitude M$\sb{\rm w}$ is 8.3. Tsunami data alone cannot resolve the entire slip distribution of the 1964 earthquake. Joint inversion of tsunami and geodetic data gives the complete slip distribution. The highest slip occurred in Prince William Sound and in the Gulf of Alaska where the Yakutat terrane is being subducted. High slip also occurred in the Kodiak Island region. Large near-trench slip was a major source of the transPacific tsunami. Areas of high slip correspond to seismologically determined areas of high moment release. The factors controlling asperity size and location are variable. This work can be used as a basis for future hypothesis testing concerning future earthquakes, asperities and seismic ... |
author2 |
Satake, Kenji Ruff, Larry |
format |
Thesis |
author |
Johnson, Jean Marie |
author_facet |
Johnson, Jean Marie |
author_sort |
Johnson, Jean Marie |
title |
Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
title_short |
Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
title_full |
Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
title_fullStr |
Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
title_full_unstemmed |
Asperity distribution of Alaskan-Aleutian earthquakes from inversion of tsunami waveforms. |
title_sort |
asperity distribution of alaskan-aleutian earthquakes from inversion of tsunami waveforms. |
publishDate |
1995 |
url |
https://hdl.handle.net/2027.42/129701 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9610154 |
long_lat |
ENVELOPE(178.303,178.303,51.788,51.788) |
geographic |
Gulf of Alaska Rat Islands |
geographic_facet |
Gulf of Alaska Rat Islands |
genre |
Kodiak Yakutat Alaska |
genre_facet |
Kodiak Yakutat Alaska |
op_relation |
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:9610154 https://hdl.handle.net/2027.42/129701 |
_version_ |
1787426065976655872 |