TOURNAI (BE)
Quarry blast8 January 2021
- Magnitude
- 2.1ML
- Depth
- 5.0km ± 2.1
- Belgian time
- 13:00:092021-01-08
- UTC
- 12:00:092021-01-08
Main parameters
| Date and time | 2021-01-08 12:00:09 UTC 2021-01-08 13:00:09 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.633° N, 3.447° E Uncertainty ± 3.4 km |
| Depth of hypocenter | 5.0 ± 2.1 km |
| Event ID | ROB 11845 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-01-12 10:48:27 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
- 29.3 – 198.4km
- Mean velocity, P wave
- 6.0km/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. Hypocenter at a depth of 5.0 km. P wave: 5 measurements, root-mean-square deviation 0.19 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)7 stations | |||||
| LESLessines | 29.3 | 73 | 12:00:14.49+5.30 s | 12:00:18.42+9.23 s | 3.93 |
| BOUBougnies | 44.5 | 127 | 12:00:16.71+7.52 s | – | – |
| SKQSteenkerque | 44.8 | 87 | 12:00:16.54+7.35 s | 12:00:22.24+13.05 s | 5.70 |
| BRQBracquegnies | 51.6 | 109 | 12:00:17.75+8.56 s | – | – |
| DOUDourbes | 101.2 | 126 | 12:00:26.30+17.11 s | 12:00:39.03+29.84 s | 12.73 |
| MEMHMembach | 181.4 | 90 | 12:00:38.69+29.50 s | 12:00:58.12+48.93 s | 19.43 |
| KLBKalborn | 198.4 | 106 | 12:00:40.20+31.01 s | 12:01:03.66+54.47 s | 23.46 |