PELM (DE)
Quarry blast3 March 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:11:402021-03-03
- UTC
- 11:11:402021-03-03
Main parameters
| Date and time | 2021-03-03 11:11:40 UTC 2021-03-03 12:11:40 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.227° N, 6.702° E Uncertainty ± 1.5 km |
| Event ID | ROB 12640 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-03 16:10:25 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
- 7
- Epicentral distance
- 44.7 – 151.3km
- Mean velocity, P wave
- 5.3km/s
- Mean velocity, S wave
- 3.2km/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: 5 measurements, root-mean-square deviation 0.44 s. S wave: 4 measurements, root-mean-square deviation 0.57 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)7 stations | |||||
| KLBKalborn | 44.7 | 252 | 11:11:47.86+7.15 s | 11:11:54.28+13.57 s | 6.42 |
| VIAVianden | 48.4 | 228 | 11:11:48.37+7.66 s | 11:11:55.87+15.16 s | 7.50 |
| HOUHouvegnez | 51.6 | 286 | 11:11:49.31+8.60 s | – | – |
| MEMHMembach | 64.9 | 311 | 11:11:52.52+11.81 s | 11:11:59.61+18.90 s | 7.09 |
| MEMSMembach | 64.9 | 311 | 11:11:52.60+11.89 s | 11:12:00.16+19.45 s | 7.56 |
| MRDMaredsous | 138.1 | 274 | 11:12:04.51+23.80 s | 11:12:22.26+41.55 s | 17.75 |
| DOUDourbes | 151.3 | 265 | 11:12:05.85+25.14 s | 11:12:25.45+44.74 s | 19.60 |