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Earthquake focal mechanisms and stress field in Sichuan-Yunnan area determined using P wave polarity and short period P and S waveform data
被引量：
1
1
作者
陈天长
郑斯华
ZHENG Si-hua
《Acta Seismologica Sinica(English Edition)》
CSCD
2001年第4期466-470,共5页
关键词
Sichuan-Yunnan
area
FOCAL
mechanism
stress
field
分类号:P315.3+3
文献标识码:A
文章编号:1000-9116(2001)04-0466-05
Based
on
waveform
data
several
methods
to
determine
FOCAL
mechanisms
of
SMALL
EARTHQUAKES
were
developed
since
1980.
Kisslinger
(1980)
and
Julian
Foulger
(1996)
proposed
an
approach
to
determine
solution
by
using
amplitude
ratio
of
P
and
S
wave.
Schwartz
(1995)
devised
a
method
to
determine
solutions
by
the
use
of
polarity
DATA
and
amplitudes
of
seismogram
envelopes.
Amplitudes
of
short
period
seismic
waves
propagating
in
an
inhomogene-ous
medium
ARE
sensitive
to
the
variation
in
velocity
and
Q
structure.
Nakamura
et
al
(1999)
took
medium
inhomo-geneity
into
account
in
determining
FOCAL
mechanisms
of
SMALL
EARTHQUAKES
using
waveform
data.
If
the
locations
of
SMALL
EARTHQUAKES
ARE
concentrated
in
a
SMALL
region
we
can
assume
that
the
raypaths
from
the
events
to
a
given
station
ARE
almost
the
same.
So
P
and
S
wave
attenuations
ARE
independent
of
event
locations.
In
this
case
it
is
con-venient
to
determine
FOCAL
mechanisms
of
these
events
by
using
short
period
P
and
S
wave
dataj.
FOCAL
mechanism
solutions
of
SMALL
EARTHQUAKES
in
5
regions
i.e.
Rongchang
Mabian-Muchuan
Ya'an
Baoxing
and
Mianzhu
which
ARE
covered
by
the
Chengdu
Telemetered
Network
ARE
obtained
by
analyzing
the
P
polarity
and
short
body
wave
amplitude
DATA
recorded
in
the
network
since
1992.
According
to
the
method
proposed
by
Gephart
and
Forsyth
(1984)
based
on
well
determined
FOCAL
mechanism
solutions
in
15
sub-zones
of
Sichuan
and
Yunnan
area
three
principal
stress
tensors
s1
s2
and
s3
instead
of
averages
of
P
B
and
T
axis
of
the
solutions
ARE
determined
to
represent
the
regional
stress
field
distribution.……
下载PDF
职称材料
题名
Earthquake focal mechanisms and stress field in Sichuan-Yunnan area determined using P wave polarity and short period P and S waveform data
被引量：
1
1
作者
陈天长
郑斯华
ZHENG Si-hua
机构
Seismological Bureau of Sichuan Province
National Research Institute for Earth Science and Disaster Prevention
Center for Analysis and Prediction
出处
《Acta Seismologica Sinica(English Edition)》
CSCD
2001年第4期466-470,共5页
基金
Chinese Joint Seismological Science Foundation, National Key Foundamental Research Plan "Mechanism and Prediction of Continental
关键词
Sichuan-Yunnan
area
FOCAL
mechanism
stress
field
分类号:P315.3+3
文献标识码:A
文章编号:1000-9116(2001)04-0466-05
Based
on
waveform
data
several
methods
to
determine
FOCAL
mechanisms
of
SMALL
EARTHQUAKES
were
developed
since
1980.
Kisslinger
(1980)
and
Julian
Foulger
(1996)
proposed
an
approach
to
determine
solution
by
using
amplitude
ratio
of
P
and
S
wave.
Schwartz
(1995)
devised
a
method
to
determine
solutions
by
the
use
of
polarity
DATA
and
amplitudes
of
seismogram
envelopes.
Amplitudes
of
short
period
seismic
waves
propagating
in
an
inhomogene-ous
medium
ARE
sensitive
to
the
variation
in
velocity
and
Q
structure.
Nakamura
et
al
(1999)
took
medium
inhomo-geneity
into
account
in
determining
FOCAL
mechanisms
of
SMALL
EARTHQUAKES
using
waveform
data.
If
the
locations
of
SMALL
EARTHQUAKES
ARE
concentrated
in
a
SMALL
region
we
can
assume
that
the
raypaths
from
the
events
to
a
given
station
ARE
almost
the
same.
So
P
and
S
wave
attenuations
ARE
independent
of
event
locations.
In
this
case
it
is
con-venient
to
determine
FOCAL
mechanisms
of
these
events
by
using
short
period
P
and
S
wave
dataj.
FOCAL
mechanism
solutions
of
SMALL
EARTHQUAKES
in
5
regions
i.e.
Rongchang
Mabian-Muchuan
Ya'an
Baoxing
and
Mianzhu
which
ARE
covered
by
the
Chengdu
Telemetered
Network
ARE
obtained
by
analyzing
the
P
polarity
and
short
body
wave
amplitude
DATA
recorded
in
the
network
since
1992.
According
to
the
method
proposed
by
Gephart
and
Forsyth
(1984)
based
on
well
determined
FOCAL
mechanism
solutions
in
15
sub-zones
of
Sichuan
and
Yunnan
area
three
principal
stress
tensors
s1
s2
and
s3
instead
of
averages
of
P
B
and
T
axis
of
the
solutions
ARE
determined
to
represent
the
regional
stress
field
distribution.……
Keywords
Sichuan-Yunnan area
focal mechanism
stress field
分类号
P315.33 [天文地球—地震学]
下载PDF
职称材料
题名
作者
出处
发文年
被引量
操作
1
Earthquake focal mechanisms and stress field in Sichuan-Yunnan area determined using P wave polarity and short period P and S waveform data
陈天长
郑斯华
ZHENG Si-hua
《Acta Seismologica Sinica(English Edition)》
CSCD
2001
1
下载PDF
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