CHARLEROI (BE)
Quarry blast23 June 2020
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:08:472020-06-23
- UTC
- 10:08:472020-06-23
Main parameters
| Date and time | 2020-06-23 10:08:47 UTC 2020-06-23 12:08:47 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.407° N, 4.387° E Uncertainty ± 0.8 km |
| Event ID | ROB 10335 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-06-23 17:03:59 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
- 29.5 – 127.5km
- Mean velocity, P wave
- 8.3km/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: 4 measurements, root-mean-square deviation 0.07 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 | |||||
| MRDMaredsous | 29.5 | 113 | – | 10:08:56.88+9.11 s | – |
| BOUBougnies | 31.5 | 267 | 10:08:53.46+5.69 s | – | – |
| SKQSteenkerque | 34.6 | 321 | 10:08:53.64+5.87 s | – | – |
| DOUDourbes | 37.7 | 157 | 10:08:54.14+6.37 s | 10:08:59.79+12.02 s | 5.65 |
| RCHRochefort | 66.1 | 115 | 10:08:57.53+9.76 s | – | – |
| KLBKalborn | 127.5 | 105 | 10:09:09.41+21.64 s | – | – |