TOURNAI (BE)
Quarry blast19 January 2022
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:03:522022-01-19
- UTC
- 12:03:522022-01-19
Main parameters
| Date and time | 2022-01-19 12:03:52 UTC 2022-01-19 13:03:52 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.646° N, 3.539° E Uncertainty ± 2.7 km |
| Event ID | ROB 15220 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-01-20 16:33:37 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
- 10
- Epicentral distance
- 38.3 – 127.5km
- Mean velocity, P wave
- 5.6km/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: 9 measurements, root-mean-square deviation 0.29 s. S wave: 4 measurements, root-mean-square deviation 1.05 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)10 stations | |||||
| SKQSteenkerque | 38.3 | 89 | 12:03:59.07+6.92 s | 12:04:01.58+9.43 s | 2.51 |
| BRQBracquegnies | 46.1 | 113 | 12:04:00.19+8.04 s | – | – |
| RQRRonquières | 48.7 | 95 | 12:04:00.55+8.40 s | – | – |
| BDHNBois d'Haine | 50.1 | 107 | 12:04:00.90+8.75 s | – | – |
| SNFSeneffe | 54.8 | 106 | 12:04:01.44+9.29 s | 12:04:09.10+16.95 s | 7.66 |
| TGATangissart | 69.7 | 93 | 12:04:03.99+11.84 s | – | – |
| OSTBOostende | 78.2 | 328 | 12:04:05.55+13.40 s | – | – |
| DOUDourbes | 96.9 | 129 | 12:04:08.80+16.65 s | 12:04:20.52+28.37 s | 11.72 |
| GESGesves | 113.5 | 104 | 12:04:11.46+19.31 s | 12:04:26.89+34.74 s | 15.43 |
| CLAClavier | 127.5 | 101 | 12:04:13.29+21.14 s | 12:04:31.25+39.10 s | 17.96 |