The seismotectonic significance of the seismic swarm in the Brabant Massif (Belgium)
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1 The seismotectonic significance of the seismic swarm in the Brabant Massif (Belgium) Koen VAN NOTEN, Thomas LECOCQ, Thierry CAMELBEECK Seismology-Gravimetry, Royal Observatory of Belgium, Brussels, Belgium Anjana K. SHAH U.S. Geological Survey, Denver, U.S.A. EGU2015 TS4.1/SM6.4 Active tectonics and the earthquake cycle Figures in this presentation are published in Van Noten et al Seismotectonic significance of the Walloon Brabant seismic swarm in the Brabant Massif. Tectonophysics doi: /j.tecto
2 Seismic activity in Belgium Seismic Activity The Netherlands Germany 51.6 N Belgium The Brabant Massif 51.0 N Seismic Swarm Aeromagnetic map of Belgium as background Hainaut Ardennes 50.4 N Earthquake depth < 10 km km >20 km France 49.8 N 49.2 N 3 E 4.5 E 6 E 7.5 E
3 The Walloon Brabant Seismic Swarm Temporary network deployed during the seismic swarm Permanent stations Increasing epicentral distance
4 The Walloon Brabant Seismic Swarm A A A A Aim of this study Seismotectonic significance of the seismic swarm? Link between local geology and the swarm? Methodology Location improvement by cross-correlation Aeromagnetic filtering
5 Relocation by cross-correlation HypoDD Waveform similarity of co-located events at local station OTT Improvement of P- & S-wave arrivals allow event location improvement
6 Relocation by cross-correlation After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m Van Noten et al Tectonophysics Focal Mechanisms Of largest events only Consistent left-lateral strike-slip Regional stress tensor WNW-ESE
7 Improved hypocentre distribution After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m N
8 Improved hypocentre distribution N After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m
9 Improved hypocentre distribution N After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m
10 Improved hypocentre distribution N After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m
11 Improved hypocentre distribution N After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m
12 Improved hypocentre distribution N After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m
13 Improved hypocentre distribution After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m N
14 Improved hypocentre distribution After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m N
15 Improved hypocentre distribution After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m N
16 Improved hypocentre distribution After relocation: Improved epicentre and hypocentre distribution 1.5 km long, 5-7 km deep, NW-SE fault structure Absolute error of swarm location +/- 200m N
17 Comparison of 1953 event with the swarm Waveform comparison of the swarm and a M L 4.0 event in epicenter area in 1953 M L M L Van Noten et al Tectonophysics
18 Seismotectonic significance of the swarm? Poor magnetic B B Earthquake Event magnitude magnitude scale Van Noten et al Tectonophysics Aeromagnetic map of Belgium - Geological Survey 1994 Arcuate shape of the Brabant Massif (BM) B Ord/Sil Cambrian core B Ord/Sil High magnetic rock formation Pronounced NW-SE lineaments craton craton Low background seismicity in the BM, yet, few large M L > 4.5 seismic events occurred in the BM seismic swarm at southern border Steep tectonic slate belt Sintubin et al Comptes Rendus Geoscience 341
19 Aeromagnetic analysis of epicenter area C C Total magnetic field RTP = influence of shallow + deep sources (deep + shallow) Aeromagnetic highs due to magnetized Lower Cambrian Tubize Formation Magnetic lows = slaty Lower Cambrian Mousty Formation Total Field, reduced-to-pole assuming Earth s local magnetic field 1/1/1994 (I=65.8, D = -2)
20 Matched bandpass filtering: methodology Separating short-wavelength that originate from shallow depths from long-wavelength anomalies that generally originate at greater depths. SW Amplitude spectrum Jef Phillips 1997 (USGS) C C Seismic swarm NE natural breaks Filter 1 1. Amplitude spectra along a profile 2. Calculation of frequency-amplitude spectra 3. Finding natural breaks that correspond to equivalent depths 4. Calculation of anomaly map through the inverse transform = carefully chosen bandpass filter Filter 1 Filter 2 P km km P km 0.19 km P km 0.47 km P km 1.18 km P km 4.55 km
21 Matched bandpass filtering: methodology Separating short-wavelength that originate from shallow depths from long-wavelength anomalies that generally originate at greater depths. SW Amplitude spectrum Seismic swarm Jef Phillips 1997 (USGS) NE Filter 2 1. Amplitude spectra along a profile 2. Calculation of frequency-amplitude spectra 3. Finding natural breaks that correspond to equivalent depths 4. Calculation of anomaly map through the inverse transform = carefully chosen bandpass filter Useful for seismology? Hell yeah! Generate different aeromagnetic maps that represent sources near hypocenter depths. Filter 1 Filter 2 P km km P km 0.19 km P km 0.47 km P km 1.18 km P km 4.55 km
22 Aeromagnetic bandpass filtering applied to epicentre area Filter 1 Filter 2 Total field Reduced to the Pole 1.1 km 2.1 km 4.5 km 7.2 km Bandpass filtered Low-pass filtered Reduced to the Pole aeromagnetic filtered maps By applying different filters, different depth maps can be made. The seismic swarm is limited in size and located in the poorly magnetic shaly Mousty Formation.
23 Conclusions Seismotectonic significance of the swarm? 1. Magnetic filtering demonstrates that the fault is: bordered by magnetic bodies with diff. orientations bordered by rocks of different stiffness limited in size = isolated structure in a shaly rock body 2. Limitation in size explains the restriction in seismicity 3. Orientation fits the NW-SE structural grain of the BM 4. This study shows the importance of inherited fault structures in an intraplate seismotectonic setting Bandpass filtered Low-pass filtered 5. Limited seismic hazard due to fault fragmentation References Van Noten et al Seismotectonic significance of the Walloon Brabant seismic swarm in the Brabant Massif. Tectonophysics Sintubin, M., Arcuate fold and cleavage patterns in the southeastern part of the Anglo-Brabant fold Belt (Belgium): tectonic implications. Tectonophysics 309, Debacker et al The supposed thrust fault in the Dyle-Thyle outcrop area (southern Brabant Massif, Belgium) re-interpreted as a folded low-angle extensional detachment. Geologica Belgica 8,
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