PECQ (BE)
Quarry blast21 January 2020
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:31:552020-01-21
- UTC
- 11:31:552020-01-21
Main parameters
| Date and time | 2020-01-21 11:31:55 UTC 2020-01-21 12:31:55 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.702° N, 3.330° E Uncertainty ± 6.3 km |
| Event ID | ROB 9155 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2020-01-21 14:40:04 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
- 11
- Epicentral distance
- 53.4 – 208.6km
- Mean velocity, P wave
- 5.9km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 8 measurements, root-mean-square deviation 0.22 s. S wave: 4 measurements, root-mean-square deviation 0.33 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)11 stations | |||||
| SKQSteenkerque | 53.4 | 96 | 11:32:04.67+9.49 s | 11:32:10.65+15.47 s | 5.98 |
| BOUBougnies | 55.8 | 128 | 11:32:04.85+9.67 s | – | – |
| BRQBracquegnies | 62.2 | 113 | 11:32:05.81+10.63 s | – | – |
| RQRRonquières | 64.2 | 99 | 11:32:06.25+11.07 s | – | – |
| OSTBOostende | 65.7 | 335 | 11:32:06.86+11.68 s | 11:32:13.83+18.65 s | 6.97 |
| TGATangissart | 85.0 | 97 | 11:32:09.46+14.28 s | – | – |
| MRDMaredsous | 111.3 | 113 | 11:32:14.08+18.90 s | 11:32:28.00+32.82 s | 13.92 |
| DOUDourbes | 112.5 | 126 | 11:32:14.44+19.26 s | 11:32:27.92+32.74 s | 13.48 |
| GESGesves | 129.5 | 105 | 11:32:17.02+21.84 s | 11:32:32.03+36.85 s | 15.01 |
| CLAClavier | 143.3 | 102 | 11:32:18.88+23.70 s | – | – |
| KLBKalborn | 208.6 | 108 | 11:32:29.07+33.89 s | – | – |