Example 2f (2025-02-13 20:44:56 Vrancea)

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

Hypocenter location

Agency
RMP
Origin time
2025-02-13 20:44:56
Latitude
45.544° N
Longitude
26.410° E
Depth
119.5 km
Magnitude
4.4

Results

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

Centroid location

absolute relative
Time 2025-02-13 20:44:55 0.91 s before origin time
Latitude 45.515° N 3177 m south of the epicenter
Longitude 26.492° E 6354 m east of the epicenter
Depth 125.9 km 6.4 km deeper than location

Moment tensor and its quality

Centroid position
depth 125.9 km
Seismic moment
scalar seismic moment M0 1.34e+15 Nm
moment magnitude Mw 4.1
Moment tensor components
Mrr 1.05 * 1e+15
Mθθ -0.65 * 1e+15
Mϕϕ -0.75 * 1e+15
Mrθ -0.31 * 1e+15
Mrϕ -0.21 * 1e+15
Mθϕ -0.39 * 1e+15
Moment tensor decomposition
DC 62 %
CLVD 29 %
ISO -9 %
strike 38 / 225
dip 36 / 54
rake 84 / 94
Quality measures
condition number 5
variance reduction 53 %

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)
RO:MLR HH 1.0 1.0 1.0 37 261 0.03 0.15
RO:VRI HH 1.0 1.0 1.0 43 35 0.03 0.15
RO:TULR HH 1.0 1.0 1.0 46 26 0.03 0.15
Y8:RO43A HH --- 1.0 1.0 123 347 0.03 0.15
Y8:RO12A 00 HH --- 1.0 --- 124 211 0.03 0.15
RO:AMRR HH --- 1.0 1.0 127 145 0.03 0.15
RO:BUC1 HH --- 1.0 --- 136 193 0.03 0.15
RO:CFR HH 1.0 1.0 --- 141 106 0.03 0.15

Mouse detection

RO43A HHZ: MOUSE detected, ignoring component in inversion (time of onset: 18.7 s, amplitude: 3.37e-08 m s^-2, fit: 0.96)
RO12A HHZ: MOUSE detected, ignoring component in inversion (time of onset: 65.7 s, amplitude: 6.61e-07 m s^-2, fit: 0.84)
RO12A HHE: MOUSE detected, ignoring component in inversion (time of onset: 94.6 s, amplitude: 1.97e-07 m s^-2, fit: 0.81)
AMRR HHZ: MOUSE detected, ignoring component in inversion (time of onset: 45.3 s, amplitude: 1.39e-07 m s^-2, fit: 0.81)
BUC1 HHZ: MOUSE detected, ignoring component in inversion (time of onset: -0.2 s, amplitude: 1.39e-07 m s^-2, fit: 0.89)
BUC1 HHE: MOUSE detected, ignoring component in inversion (time of onset: 34.5 s, amplitude: 1.02e-07 m s^-2, fit: 0.90)
CFR HHE: MOUSE detected, ignoring component in inversion (time of onset: 5.8 s, amplitude: 1.42e-08 m s^-2, fit: 0.96)

Data source

Station coordinates: input/vrancea/2025/02/13/network1.stn
Loading data from fdsnws server(s): https://seismos24.infp.ro/fdsnws/

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
315
horizontal step
3177 m
vertical step
3177 m
grid radius
12.170 km
minimal depth
107.330 km
maximal depth
131.670 km
rupture length (estimated)
1.670 km

Grid-search over time

min
-2.00 s (-203 samples)
max
3.67 s (367 samples)
step
0.07 s ( 7 samples)

Green's function calculation

Crustal model
vel_models/vr_adanci/crustal_oncescu.dat
npts
256
tl
212.48
freq
129
npts for inversion
233
source time function
step in displacement

Sampling frequencies

Data sampling
100.0 Hz
Common sampling
100.0 Hz
Decimation factor
83 x
Sampling used
1.2 Hz