FONTAINE-L'EVEQUE (BE)
Quarry blast18 May 2020
- Magnitude
- 1.3ML
- Depth
- 10.0km ± 3.3
- Belgian time
- 14:09:352020-05-18
- UTC
- 12:09:352020-05-18
Main parameters
| Date and time | 2020-05-18 12:09:35 UTC 2020-05-18 14:09:35 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.395° N, 4.362° E Uncertainty ± 1.2 km |
| Depth of hypocenter | 10.0 ± 3.3 km |
| Event ID | ROB 10035 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-05-18 16:42:20 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
- 18.6 – 141.1km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.4km/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: 12 measurements, root-mean-square deviation 0.35 s. S wave: 11 measurements, root-mean-square deviation 0.40 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)15 stations | ||||||
| BRQBracquegnies | 18.6 | 301 | 12:09:39.73+3.93 s | – | – | – |
| RQRRonquières | 25.3 | 338 | 12:09:40.09+4.29 s | 12:09:44.04+8.24 s | 3.95 | 22.7 |
| TGATangissart | 25.9 | 26 | 12:09:40.15+4.35 s | 12:09:43.91+8.11 s | 3.76 | – |
| BOUBougnies | 29.6 | 269 | 12:09:40.29+4.49 s | 12:09:45.85+10.05 s | 5.56 | 23.6 |
| MRDMaredsous | 30.7 | 110 | 12:09:40.53+4.73 s | 12:09:44.86+9.06 s | 4.33 | 14.3 |
| SKQSteenkerque | 34.6 | 325 | 12:09:41.60+5.80 s | 12:09:45.96+10.16 s | 4.36 | – |
| DOUDourbes | 37.3 | 153 | 12:09:42.13+6.33 s | 12:09:47.60+11.80 s | 5.47 | – |
| UCCBUccle | 44.7 | 360 | – | 12:09:49.36+13.56 s | – | – |
| GESGesves | 51.6 | 91 | 12:09:44.27+8.47 s | 12:09:51.26+15.46 s | 6.99 | 8.9 |
| CLAClavier | 66.9 | 87 | 12:09:46.86+11.06 s | 12:09:55.93+20.13 s | 9.07 | 8.8 |
| RCHRochefort | 67.2 | 113 | 12:09:47.13+11.33 s | 12:09:55.87+20.07 s | 8.74 | 13.3 |
| LCHLa Chartreuse | 91.9 | 72 | 12:09:51.73+15.93 s | – | – | – |
| HOUHouvegnez | 117.0 | 92 | 12:09:55.34+19.54 s | 12:10:09.85+34.05 s | 14.51 | – |
| KLBKalborn | 128.9 | 104 | 12:09:57.40+21.60 s | 12:10:13.35+37.55 s | 15.95 | – |
| VIAVianden | 141.1 | 111 | 12:09:57.62+21.82 s | 12:10:15.66+39.86 s | 18.04 | – |