TOURNAI (BE)
Quarry blast30 January 2019
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:02:422019-01-30
- UTC
- 12:02:422019-01-30
Main parameters
| Date and time | 2019-01-30 12:02:42 UTC 2019-01-30 13:02:42 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.667° N, 3.402° E Uncertainty ± 24.0 km |
| Event ID | ROB 7745 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-30 16:20:11 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
- 31.5 – 141.7km
- Mean velocity, P wave
- 6.4km/s
- Mean velocity, S wave
- 3.5km/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 0.53 s. S wave: 4 measurements, root-mean-square deviation 0.67 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 | |||||
| LESLessines | 31.5 | 81 | 12:02:48.90+6.26 s | 12:02:52.99+10.35 s | 4.09 |
| SKQSteenkerque | 48.0 | 92 | 12:02:50.91+8.27 s | 12:02:55.98+13.34 s | 5.07 |
| BOUBougnies | 49.4 | 129 | 12:02:52.07+9.43 s | – | – |
| BRQBracquegnies | 56.0 | 111 | 12:02:52.08+9.44 s | – | – |
| RQRRonquières | 58.6 | 96 | 12:02:51.96+9.32 s | – | – |
| MRDMaredsous | 105.1 | 112 | 12:03:00.43+17.79 s | 12:03:13.73+31.09 s | 13.30 |
| DOUDourbes | 106.1 | 126 | 12:02:59.56+16.92 s | 12:03:13.95+31.31 s | 14.39 |
| GESGesves | 123.5 | 104 | 12:03:03.33+20.69 s | 12:03:19.73+37.09 s | 16.40 |
| CLAClavier | 137.5 | 101 | 12:03:07.07+24.43 s | 12:03:23.49+40.85 s | 16.42 |
| RCHRochefort | 141.7 | 113 | 12:03:06.77+24.13 s | 12:03:24.16+41.52 s | 17.39 |