COMBLAIN-AU-PONT (BE)
Quarry blast30 April 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:29:122021-04-30
- UTC
- 12:29:122021-04-30
Main parameters
| Date and time | 2021-04-30 12:29:12 UTC 2021-04-30 14:29:12 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.491° N, 5.554° E Uncertainty ± 0.6 km |
| Event ID | ROB 13290 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-30 16:01:30 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 7
- Epicentral distance
- 19.6 – 58.8km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 7 measurements, root-mean-square deviation 0.21 s. S wave: 6 measurements, root-mean-square deviation 0.23 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)6 stations | |||||
| CLAClavier | 19.6 | 246 | 12:29:15.70+3.15 s | 12:29:19.14+6.59 s | 3.44 |
| MEMHMembach | 34.9 | 68 | 12:29:18.60+6.05 s | 12:29:23.38+10.83 s | 4.78 |
| MEMSMembach | 34.9 | 68 | 12:29:18.62+6.07 s | 12:29:23.31+10.76 s | 4.69 |
| GESGesves | 35.2 | 251 | 12:29:18.73+6.18 s | 12:29:23.61+11.06 s | 4.88 |
| MRGMont Rigi | 37.0 | 86 | 12:29:18.86+6.31 s | – | – |
| KLBKalborn | 58.8 | 138 | 12:29:23.19+10.64 s | 12:29:30.40+17.85 s | 7.21 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 40.4 | 41 | 12:29:19.65+7.10 s | 12:29:25.07+12.52 s | 5.42 |