CELLES (BE)
Quarry blast4 May 2020
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:31:302020-05-04
- UTC
- 10:31:302020-05-04
Main parameters
| Date and time | 2020-05-04 10:31:30 UTC 2020-05-04 12:31:30 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.674° N, 3.472° E Uncertainty ± 2.4 km |
| Event ID | ROB 9935 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-04 15:06:07 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
- 6
- Epicentral distance
- 43.1 – 198.1km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.43 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | |||||
| SKQSteenkerque | 43.1 | 93 | 10:31:37.80+7.79 s | 10:31:43.70+13.69 s | 5.90 |
| BOUBougnies | 46.1 | 133 | 10:31:38.01+8.00 s | – | – |
| BRQBracquegnies | 51.7 | 114 | 10:31:37.98+7.97 s | – | – |
| MRDMaredsous | 100.8 | 114 | 10:31:47.21+17.20 s | – | – |
| DOUDourbes | 102.6 | 128 | 10:31:47.32+17.31 s | 10:31:59.85+29.84 s | 12.53 |
| KLBKalborn | 198.1 | 108 | 10:32:02.14+32.13 s | 10:32:25.35+55.34 s | 23.21 |