Example 2 (2013-12-12 00:59:18 Sargans)

Method
Waveform inversion for full moment tensor (6 components)
with the data covariance matrix based on real noise
with crosscovariance between components.
Reference
Vackář, Gallovič, Burjánek, Zahradník, and Clinton. Bayesian ISOLA: new tool for automated centroid moment tensor inversion, in preparation, PDF

Hypocenter location

Agency
SED
Origin time
2013-12-12 00:59:18
Latitude
47.057° N
Longitude
9.486° E
Depth
3.6 km
Magnitude
4.2

Results

MT
moment tensor best solution
MT
moment tensor uncertainty
MT
DC-part uncertainty

Centroid location

absolute relative
Time 2013-12-12 00:59:18 0.60 s before origin time
Latitude 47.063° N 617 m north of the epicenter
Longitude 9.478° E 617 m west of the epicenter
Depth 6.1 km 2.5 km deeper than location

Moment tensor and its quality

Centroid position
depth 6.1 km
Seismic moment
scalar seismic moment M0 2.88e+14 Nm
moment magnitude Mw 3.6
Moment tensor components
Mrr 0.58 * 1e+14
Mθθ 0.27 * 1e+14
Mϕϕ 0.39 * 1e+14
Mrθ 0.25 * 1e+14
Mrϕ -0.54 * 1e+14
Mθϕ -2.37 * 1e+14
Moment tensor decomposition
DC 83 %
CLVD -3 %
ISO 14 %
strike 182 / 90
dip 83 / 77
rake 13 / 173
Quality measures
condition number 3
variance reduction 79 %

Histograms—uncertainty of MT parameters

DC-part
CLVD-part
CLVD-part
moment magnitude

Histograms—uncertainty of centroid position and time

centroid depth
position east-west
position north-south
centroid time

Data used

stations used

Components used in inversion and their weights

station component distance * azimuth fmin fmax
code channel Z N E (km) (deg) (Hz) (Hz)
CH:LIENZ HH 1.0 1.0 1.0 26 1 0.02 0.15
CH:SGT04 HH 1.0 1.0 1.0 34 342 0.02 0.15
CH:PANIX HH 1.0 1.0 1.0 38 228 0.02 0.15
OE:DAVA HH 1.0 1.0 1.0 39 49 0.02 0.15
CH:SGT03 HH --- 1.0 1.0 41 328 0.02 0.15
CH:SGT05 HH 1.0 1.0 1.0 43 357 0.02 0.15
CH:DAVOX HH 1.0 1.0 1.0 43 136 0.02 0.15
CH:LLS HH 1.0 1.0 1.0 43 237 0.02 0.15
CH:SGT01 HH 1.0 --- --- 44 343 0.02 0.15

Mouse detection

SGT03 HHZ: MOUSE detected, ignoring component in inversion (time of onset: 28.9 s, amplitude: 7.05e-08 m s^-2, fit: 0.91)
SGT01 HHN: MOUSE detected, ignoring component in inversion (time of onset: 31.3 s, amplitude: 8.91e-08 m s^-2, fit: 0.94)
SGT01 HHE: MOUSE detected, ignoring component in inversion (time of onset: 21.0 s, amplitude: 7.39e-08 m s^-2, fit: 0.91)

Data source

Station coordinates: input/example_2_SAC/network.stn
Loading data from files. data dir: input/example_2_SAC/sac/ p&z dir: input/example_2_SAC//pzfiles/

waveform fit
(filtered)
waveform fit
(non-filtered)
waveform spectra
 
before-event noise
 
data covariance matrix
 

Stability and uncertainty of the solution

Posterior probability density function (PPD)

PPD: top view
PPD: north-south view
PPD: west-east view

Stability in space (top view)

click to compare different depths

Stability in space (side view)

click to compare different points of view

Calculation parameters

Grid-search over space

number of points
540
horizontal step
617 m
vertical step
617 m
grid radius
2.326 km
minimal depth
1.000 km
maximal depth
7.926 km
rupture length (estimated)
1.326 km

Grid-search over time

min
-1.00 s (-39 samples)
max
2.33 s ( 93 samples)
step
0.07 s ( 3 samples)

Green's function calculation

Crustal model
input/example_2_SAC/crustal.dat
npts
64
tl
52.80
freq
33
npts for inversion
54
source time function
triangle in velocity, length = 2.0 s

Sampling frequencies

Data sampling
120.0 Hz, 200.0 Hz, 80.0 Hz
Common sampling
40.0 Hz
Decimation factor
33 x
Sampling used
1.2 Hz