TOURNAI (BE)
Quarry blast24 July 2019
- Magnitude
- 1.3ML
- Depth
- 10.0km ± 4.2
- Belgian time
- 12:59:372019-07-24
- UTC
- 10:59:372019-07-24
Main parameters
| Date and time | 2019-07-24 10:59:37 UTC 2019-07-24 12:59:37 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.663° N, 3.514° E Uncertainty ± 2.7 km |
| Depth of hypocenter | 10.0 ± 4.2 km |
| Event ID | ROB 8420 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2019-07-24 13:28:43 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
- 14
- Epicentral distance
- 23.9 – 194.9km
- Mean velocity, P wave
- 6.1km/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. Hypocenter at a depth of 10.0 km. P wave: 10 measurements, root-mean-square deviation 0.35 s. S wave: 6 measurements, root-mean-square deviation 0.38 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)14 stations | ||||||
| LESLessines | 23.9 | 77 | 10:59:42.08+4.26 s | 10:59:46.20+8.38 s | 4.12 | – |
| SKQSteenkerque | 40.1 | 92 | 10:59:44.29+6.47 s | 10:59:49.94+12.12 s | 5.65 | – |
| BOUBougnies | 43.1 | 135 | 10:59:44.66+6.84 s | 10:59:51.52+13.70 s | 6.86 | – |
| BRQBracquegnies | 48.5 | 114 | 10:59:45.49+7.67 s | – | – | – |
| RQRRonquières | 50.7 | 97 | 10:59:45.67+7.85 s | – | – | – |
| UCCBUccle | 61.6 | 76 | 10:59:47.56+9.74 s | 10:59:56.82+19.00 s | 9.26 | – |
| OSTBOostende | 75.7 | 328 | 10:59:50.66+12.84 s | 11:00:00.63+22.81 s | 9.97 | – |
| MRDMaredsous | 97.6 | 114 | 10:59:53.74+15.92 s | – | – | – |
| DOUDourbes | 99.5 | 129 | 10:59:54.71+16.89 s | 11:00:07.71+29.89 s | 13.00 | – |
| GESGesves | 115.8 | 105 | 10:59:56.79+18.97 s | – | – | – |
| CLAClavier | 129.6 | 101 | 10:59:59.57+21.75 s | 11:00:15.52+37.70 s | 15.95 | 4.2 |
| RCHRochefort | 134.2 | 114 | 10:59:59.89+22.07 s | 11:00:15.22+37.40 s | 15.33 | – |
| HOUHouvegnez | 180.0 | 100 | 11:00:07.06+29.24 s | – | – | – |
| KLBKalborn | 194.9 | 108 | 11:00:08.67+30.85 s | – | – | – |