HOTTON (BE)
Quarry blast30 April 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:56:552021-04-30
- UTC
- 09:56:552021-04-30
Main parameters
| Date and time | 2021-04-30 09:56:55 UTC 2021-04-30 11:56:55 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.240° N, 5.435° E Uncertainty ± 2.8 km |
| Event ID | ROB 13275 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-30 15:37:15 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
- 17.6 – 62.1km
- Mean velocity, P wave
- 5.7km/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 0.35 s. S wave: 7 measurements, root-mean-square deviation 0.21 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 | |||||
| RCHRochefort | 17.6 | 238 | 09:56:58.25+2.90 s | 09:57:00.69+5.34 s | 2.44 |
| CLAClavier | 22.0 | 335 | 09:56:59.16+3.81 s | 09:57:02.42+7.07 s | 3.26 |
| GESGesves | 29.6 | 303 | 09:57:00.43+5.08 s | 09:57:04.49+9.14 s | 4.06 |
| HOUHouvegnez | 42.6 | 72 | 09:57:02.81+7.46 s | 09:57:08.23+12.88 s | 5.42 |
| MRDMaredsous | 48.0 | 279 | 09:57:03.18+7.83 s | 09:57:09.82+14.47 s | 6.64 |
| KLBKalborn | 50.6 | 108 | 09:57:04.25+8.90 s | 09:57:10.36+15.01 s | 6.11 |
| DOUDourbes | 62.1 | 255 | 09:57:06.92+11.57 s | 09:57:14.00+18.65 s | 7.08 |