TOURNAI (BE)
Quarry blast22 January 2019
- Magnitude
- 2.4ML
- Depth
- –
- Belgian time
- 13:03:572019-01-22
- UTC
- 12:03:572019-01-22
Main parameters
| Date and time | 2019-01-22 12:03:57 UTC 2019-01-22 13:03:57 Belgian time |
|---|---|
| Magnitude | ML 2.4 |
| Epicentral coordinates | 50.645° N, 3.393° E Uncertainty ± 6.2 km |
| Event ID | ROB 7685 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-01-22 13:13:34 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
- 15
- Epicentral distance
- 48.6 – 202.5km
- Mean velocity, P wave
- 5.9km/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 0.18 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)13 stations | |||||
| SKQSteenkerque | 48.6 | 89 | 12:04:05.47+8.36 s | – | – |
| BRQBracquegnies | 55.7 | 109 | 12:04:06.45+9.34 s | – | – |
| RQRRonquières | 59.0 | 94 | 12:04:06.92+9.81 s | – | – |
| UCCSUccle | 70.3 | 76 | 12:04:08.76+11.65 s | – | – |
| UCCBUccle | 70.3 | 76 | 12:04:09.28+12.17 s | 12:04:17.62+20.51 s | 8.34 |
| MRDMaredsous | 104.8 | 111 | 12:04:14.76+17.65 s | – | – |
| DOUDourbes | 105.1 | 125 | 12:04:15.11+18.00 s | 12:04:28.25+31.14 s | 13.14 |
| GESGesves | 123.5 | 103 | 12:04:17.88+20.77 s | – | – |
| DSLBDessel | 134.4 | 60 | 12:04:20.43+23.32 s | – | – |
| MOLTMol | 134.8 | 61 | 12:04:19.75+22.64 s | – | – |
| CLAClavier | 137.6 | 100 | 12:04:20.24+23.13 s | – | – |
| RCHRochefort | 141.3 | 112 | 12:04:21.76+24.65 s | – | – |
| KLBKalborn | 202.5 | 106 | 12:04:29.55+32.44 s | 12:04:52.80+55.69 s | 23.25 |
| Dutch seismic network (KNMI)2 stations | |||||
| VKBValkenburg | 170.5 | 81 | 12:04:24.91+27.80 s | – | – |
| HGNHeimansgroeve | 179.8 | 85 | 12:04:26.23+29.12 s | 12:04:47.92+50.81 s | 21.69 |