Example 2f (2025-10-15 04:57:19 Maramures )

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
RONDC
Origin time
2025-10-15 04:57:19
Latitude
47.760° N
Longitude
23.107° E
Depth
4.1 km
Magnitude
4.0

Results

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

Centroid location

absolute relative
Time 2025-10-15 04:57:18 0.45 s before origin time
Latitude 47.773° N 1467 m north of the epicenter
Longitude 23.049° E 4402 m west of the epicenter
Depth 2.6 km 1.5 km shallower than location

Moment tensor and its quality

Centroid position
depth 2.6 km
Seismic moment
scalar seismic moment M0 2.90e+14 Nm
moment magnitude Mw 3.6
Moment tensor components
Mrr 0.18 * 1e+14
Mθθ 1.78 * 1e+14
Mϕϕ -2.06 * 1e+14
Mrθ 1.33 * 1e+14
Mrϕ 0.14 * 1e+14
Mθϕ -1.43 * 1e+14
Moment tensor decomposition
DC 83 %
CLVD 16 %
ISO -1 %
strike 156 / 62
dip 63 / 81
rake 10 / 153
Quality measures
condition number 3
variance reduction 65 %

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:BMR HH 1.0 1.0 1.0 31 108 0.03 0.11
HU:TRPA HH 1.0 1.0 --- 59 314 0.03 0.11
UT:BRIU HH 1.0 1.0 1.0 65 354 0.03 0.11
UT:MEZ HH 1.0 1.0 1.0 89 20 0.03 0.11
RO:BORR HH --- 1.0 --- 124 234 0.03 0.11
UT:STNU HH 1.0 --- --- 148 44 0.03 0.11

Mouse detection

TRPA HHE: MOUSE detected, ignoring component in inversion (time of onset: 13.7 s, amplitude: 3.51e-08 m s^-2, fit: 0.95)
BORR HHZ: MOUSE detected, ignoring component in inversion (time of onset: 42.7 s, amplitude: 3.77e-07 m s^-2, fit: 0.88)
BORR HHE: MOUSE detected, ignoring component in inversion (time of onset: 6.2 s, amplitude: 8.05e-07 m s^-2, fit: 0.94)
STNU HHN: MOUSE detected, ignoring component in inversion (time of onset: 1.8 s, amplitude: 2.48e-05 m s^-2, fit: 0.65)
STNU HHE: MOUSE detected, ignoring component in inversion (time of onset: 8.8 s, amplitude: 1.40e-05 m s^-2, fit: 0.85)

Data source

Station coordinates: input/crustale/2025/10/15/network.stn
Loading data from fdsnws server(s): https://eida-sc3.infp.ro/fdsnws/ https://seismos24.infp.ro/fdsnws/ http://service.iris.edu/fdsnws/ http://geofon.gfz-potsdam.de/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
483
horizontal step
1467 m
vertical step
1467 m
grid radius
7.054 km
minimal depth
1.000 km
maximal depth
11.154 km
rupture length (estimated)
1.054 km

Grid-search over time

min
-1.00 s (-99 samples)
max
2.05 s (205 samples)
step
0.09 s ( 9 samples)

Green's function calculation

Crustal model
vel_models/crustale/novotony.dat
npts
256
tl
289.28
freq
129
npts for inversion
132
source time function
step in displacement

Sampling frequencies

Data sampling
100.0 Hz
Common sampling
100.0 Hz
Decimation factor
113 x
Sampling used
0.9 Hz