CELLES (BE)
Quarry blast28 September 2020
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:00:402020-09-28
- UTC
- 11:00:402020-09-28
Main parameters
| Date and time | 2020-09-28 11:00:40 UTC 2020-09-28 13:00:40 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.672° N, 3.467° E Uncertainty ± 1.4 km |
| Event ID | ROB 10965 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-09-29 18:43:45 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
- 43.4 – 119.2km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/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 0.19 s. S wave: 4 measurements, root-mean-square deviation 0.42 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)7 stations | |||||
| SKQSteenkerque | 43.4 | 93 | 11:00:48.25+7.65 s | 11:00:54.25+13.65 s | 6.00 |
| BOUBougnies | 46.2 | 133 | 11:00:48.57+7.97 s | – | – |
| BRQBracquegnies | 51.9 | 114 | 11:00:49.56+8.96 s | – | – |
| RQRRonquières | 54.1 | 97 | 11:00:49.53+8.93 s | – | – |
| MRDMaredsous | 101.1 | 113 | 11:00:57.72+17.12 s | 11:01:11.18+30.58 s | 13.46 |
| DOUDourbes | 102.7 | 128 | 11:00:58.00+17.40 s | 11:01:11.48+30.88 s | 13.48 |
| GESGesves | 119.2 | 105 | 11:01:00.85+20.25 s | 11:01:15.51+34.91 s | 14.66 |