Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | Undetermined |
| Veröffentlicht: |
Washington
United States Gov. Print. Off.
1987
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| Schriftenreihe: | United States Geological Survey: Geological Survey bulletin
1768 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | IV, 32 S. Ill., Kt. |
Internformat
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Datensatz im Suchindex
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| adam_text | Seismological Aspects of
the 1976 Eruptions of
Augustine Volcano, Alaska
ByJOHNWREEDERandJOHNCLAHR
y
U S GEOLOGICAL SURVEY BULLETIN 1768
Ingefl tHixiu
„pp r
CONTENTS
Abstract 1
Introduction 1
Seismic documentation 2
Types of seismic signals 2
Shallow earthquakes 3
Volcanic tremor 6
Large tremor (large-amplitude volcanic tremor) 7
Small tremor (small-amplitude volcanic tremor) 8
Some correlations and correlation problems between observed
eruptive activity and volcanic tremor 9
Eruption-induced air-phase signals 11
Seismic time sequence 12
The January eruptive sequence 16
The February eruptive sequence 21
The April eruptive sequence 21
Seismic data interpretations 21
Source mechanisms for the eruptions 21
Earthquake frequency-to-magnitude relationships 23
Correlations between shallow earthquakes and explosive activity 27
The air-phase mechanism 28
Seismic-geologic correlation 29
Conclusions 30
References cited 30
FIGURES
1 Map showing the Cook Inlet segment of the regional USGS and NOAA
seismograph network 2
2 Seismogram of a typical Augustine shallow earthquake on December 21,
1975, with M, =164
3 Seismograms ofmoderately shallow Augustine earthquakes on December
29, 1975 (M^ = 2 2), and on November 21, 1975 (M^ = 1 6) 4
4 Plot of S minus P arrival-time intervals at seismic station CKK versus
calculated hypocenter depths for some of the larger 1975-76 pre
emption shallow Augustine earthquakes 5
5 Hypocenters for some of the larger 1976 very shallow earthquakes of
Augustine volcano 6
6 Distribution of hypocenters for the 21:26 u t January 22, 1976, very shallow
Augustine earthquake due to the arrival times at all stations being randomly
varied 7
7 Seismogram of initial part of January 22, 1976, Augustine eruption 7
8 Seismogram of a January 23, 1976, Augustine eruption 8
9 Photograph of Alaska taken at 20:05:07 u t on January 23, 1976, by
NOAA-4 satellite 9
10 Seismogram of a January 23, 1976, Augustine eruption 11
11 Seismogram and photographs related to February 8-9, 1976, eruptive
activity of Augustine volcano 12
12 Seismogram and photograph related to a February 13, 1976, very shallow
Augustine earthquake that was followed by small tremor and an
eruptive cloud 14
13 Photographs of Augustine volcano taken by University of Washington Cloud and
Aerosol Physics Group at 23:05:06 u t and 23:54:08 u t on February 8, 19?6
14 Photograph and seismogram related to February 13, 1976, eruptive activity
at Augustine volcano 15
15 Vertical photograph of summit and northeast flank of Augustine volcano
at 03:22 u t on April 13, 1976 16
16 Seismogram showing seismic activity and eruption-induced air-phase
signals of Augustine volcano on January 24, 1976 17
17 Graph showing commencement, duration, and approximate traveltime of
Augustine eruption-induced air-phase disturbances as recorded at
sesimic stations NNL, NKA, SKL, and PWA from 20:00 u t January 23
through January 24, 1976, with respect to large tremors at Augustine
volcano as recorded by CKK 18
18-20 Histograms showing:
18 Sequence of Augustine events between November 1, 1975, and
April 30, 1976 19
19 Daily shallow-earthquake radiated energy for Augustine volcano
between November 1, 1975, and April 30, 1976 20
20 Sequence of Augustine events between 00:00 u t January 22 and
12:00 u t January 26, 1976 21
21 Graph showing Augustine January peak-to-peak amplitudes of large
tremor and local magnitudes of very shallow earthquakes during
January 22-25, 1976 22
22 Histograms showing sequence of Augustine events between 12:00 u t
February 6 and 13:00 u t February 14, 1976 24
23 Graphs showing Augustine peak-to-peak amplitudes of large tremor and
local magnitudes of shallow earthquakes during February 6-9, 1976 25
24 Histograms showing sequence of Augustine events between 00:00 u t
April 13 and 00:00 u t April 19, 1976 25
25 Graphs showing interval and cumulative frequency distributions of
magnitudes for the Augustine 1975-76 shallow earthquakes 26
26-28 Plots showing:
26 Correlations between radiated energy of very shallow Augustine
earthquakes and Augustine volcanic tremor duration between
08:30 u t January 23 and 03:30 u t January 24, 1976 27
27 Correlations between very shallow Augustine earthquake radiated
energy, moderately shallow Augustine earthquake radiated
energy, and Augustine volcanic tremor duration between
February 7 and February 14, 1976 28
28 Correlations between very shallow Augustine earthquake radiated
energy and Augustine small-tremor duration between 08:00 u t
April 16 and 16:00 u t April 18, 1976 28
29 Plots of radio soundings of the atmosphere at Kodiak, King Salmon, and
Anchorage for 12:00 u t January 23, 00:00 u t January 24, and 00:00
u t January 25 29
TABLES
1 Crustal model used for determining hypocenter locations for Augustine shallow
earthquakes 6
2 Arrival times, durations, and amplitudes of Augustine volcanic tremors at
CKK, during January 1976, including arrival times of eruption-induced
infrasonics at Fairbanks 10
3 Arrival times and durations of Augustine eruption-induced air-phase seismic
signals at NNL, NKA, SKL, and PWA, including maximum amplitudes of the
air-phase seismic signals at PWA 24
Any use of trade names is for descriptive purposes only and does not imply
endorsement by the U S Geological Survey
IV Contents
|
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| geographic | Mount Augustine (DE-588)4207330-3 gnd |
| geographic_facet | Mount Augustine |
| id | DE-604.BV000759461 |
| illustrated | Illustrated |
| indexdate | 2024-07-09T15:19:00Z |
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| publishDate | 1987 |
| publishDateSearch | 1987 |
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| series | United States Geological Survey: Geological Survey bulletin |
| series2 | United States Geological Survey: Geological Survey bulletin |
| spelling | Reeder, John W. Verfasser aut Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska by John W. Reeder and John C. Lahr Washington United States Gov. Print. Off. 1987 IV, 32 S. Ill., Kt. txt rdacontent n rdamedia nc rdacarrier United States Geological Survey: Geological Survey bulletin 1768 Geschichte 1976 gnd rswk-swf Eruption (DE-588)4138666-8 gnd rswk-swf Seismologie (DE-588)4379341-1 gnd rswk-swf Mount Augustine (DE-588)4207330-3 gnd rswk-swf Mount Augustine (DE-588)4207330-3 g Eruption (DE-588)4138666-8 s Seismologie (DE-588)4379341-1 s Geschichte 1976 z DE-604 United States Geological Survey: Geological Survey bulletin 1768 (DE-604)BV002539394 1768 HEBIS Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=000475335&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Reeder, John W. Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska United States Geological Survey: Geological Survey bulletin Eruption (DE-588)4138666-8 gnd Seismologie (DE-588)4379341-1 gnd |
| subject_GND | (DE-588)4138666-8 (DE-588)4379341-1 (DE-588)4207330-3 |
| title | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska |
| title_auth | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska |
| title_exact_search | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska |
| title_full | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska by John W. Reeder and John C. Lahr |
| title_fullStr | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska by John W. Reeder and John C. Lahr |
| title_full_unstemmed | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska by John W. Reeder and John C. Lahr |
| title_short | Seismological aspects of the 1976 eruptions of Augustine volcano, Alaska |
| title_sort | seismological aspects of the 1976 eruptions of augustine volcano alaska |
| topic | Eruption (DE-588)4138666-8 gnd Seismologie (DE-588)4379341-1 gnd |
| topic_facet | Eruption Seismologie Mount Augustine |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=000475335&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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