Detection and analysis of the microseismic activity near the city of Landau, Upper Rhine Graben, Germany

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1 Detection and analysis of the microseismic activity near the city of Landau, Upper Rhine Graben, Germany Jörn Groos and Joachim Ritter KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

2 Outline Geothermal power plants and seismicity near Landau Absolute localisations for the Landau reservoir (M L > 0.6) Detection of microseismic events (M L < 2) Peak Ground Velocities (PGV) Perceptibility (DIN 4150) Determination of M L according to the earthquake state service Conclusions Jörn Groos and Joachim Ritter

3 The Landau and Insheim geothermal power plants Power plant Landau 2006 Stimulation 2007 Start of operation 15 August 2009 M L 2.7 Power plant Insheim 2009 Circulation tests (May+Nov.) 2010 Stimulation/Circulation (April) 2012 Start of operation (October) 9 April 2010 M L Jörn Groos and Joachim Ritter

4 Landau/Insheim: Seismicity May 2009 until November 2012 Locations by Erdbebendienst Südwest Earthquake state services of Baden-Württemberg (LED) and Rheinland Pfalz (LER) Power plant Landau 15 August 2009 M L 2.7 Insheim Power plant Insheim 9 April 2010 M L Jörn Groos and Joachim Ritter

5 Landau and Insheim: Seismic monitoring in Jörn Groos and Joachim Ritter

6 Landau and Insheim: Seismic monitoring in Jörn Groos and Joachim Ritter

7 Landau and Insheim: Seismic monitoring today Jörn Groos and Joachim Ritter

8 Landau and Insheim: Seismic monitoring today Jörn Groos and Joachim Ritter

9 Landau/Insheim: Seismicity May 2009 until November 2012 Locations by Erdbebendienst Südwest Earthquake state services of Baden-Württemberg (LED) and Rheinland Pfalz (LER) Power plant Landau 15 August 2009 M L 2.7 Insheim Power plant Insheim 9 April 2010 M L Jörn Groos and Joachim Ritter

10 Landau: Absolute (re)localisation of events with M L > 0.6 Poster Jens Zeiß Jörn Groos and Joachim Ritter

11 Landau: Absolute (re)localisation of events with ML > Jörn Groos and Joachim Ritter

12 Event detection Example: Landau M L :10: epicentral distance 6 km Jörn Groos and Joachim Ritter

13 Event detection Example: Landau M L :10: epicentral distance 6 km Jörn Groos and Joachim Ritter

14 norm. ampl. norm. ampl. norm. ampl. Event detection: High waveform similiarity Z CC 0.53 N CC 0.75 E CC mm/s M L ~ mm/s Jörn Groos and Joachim Ritter

15 norm. ampl. norm. ampl. norm. ampl. Event detection: Low waveform similarity Z CC 0.17 N CC 0.52 E CC mm/s M L ~ mm/s Jörn Groos and Joachim Ritter

16 Detected seismic events: July 2009-November 2012 Insheim Landau Jörn Groos and Joachim Ritter

17 Peak Ground Velocities (PGV) TMO50 M L 2.7 Epicentral distance ~1 km TMO50 M L 1.3 Epicentral distance ~1 km Time in seconds Jörn Groos and Joachim Ritter

18 Peak Ground Velocities (PGV) over M L Jörn Groos and Joachim Ritter

19 PGVs in the Landau area: A M L 1.9 event Jörn Groos and Joachim Ritter

20 Perceptibility (DIN 4150) TMO50 M L 2.7 Epicentral distance ~1 km TMO50 M L 1.3 Epicentral distance ~1 km Time in seconds Jörn Groos and Joachim Ritter

21 Perceptibility (DIN 4150) TMO50 M L 2.7 Epicentral distance ~1 km vibration intensity K BF TMO50 M L 1.3 Epicentral distance ~1 km vibration intensity K BF Time in seconds Jörn Groos and Joachim Ritter

22 Vibration intensities (DIN 4150) over M L Jörn Groos and Joachim Ritter

23 Perceptibility in the Landau area: A M L 1.9 event Jörn Groos and Joachim Ritter

24 Determination of M L by the earthquake state service (LED) M L = log A + (1.11 ± 0.1) log r + (0.95 ± 0.2) x 10-3 r + (0.69 ± 0.05) + d ST A : Wood-Anderson amplitude in mm r : distance in km Baden-Württemberg attenuation curve (Stange, 2006) d ST : Station correction Stange, S ML Determination for Local and Regional Events Using a Sparse Network in Southwestern Germany. Journal of Seismology, 10, Jörn Groos and Joachim Ritter

25 Determination of M L in accordance to the LED Jörn Groos and Joachim Ritter

26 Determination of M L in accordance to the LED Jörn Groos and Joachim Ritter

27 Determination of M L in accordance to the LED Landau earthquake :18:25 UTC M L LED 1.9 ± 0.1 M L Station stations avg std Jörn Groos and Joachim Ritter

28 Determination of M L in accordance to the LED Jörn Groos and Joachim Ritter

29 Conclusions Landau events are located North and between the borehole landing points closer to the injection well Up to now about 500 detected events (M L > -0.5) Landau events are perceptible above M L ~ 1.3 Landau events are well perceptible above M L ~ 1.7 M L is estimated in accordance to the earthquake state service by M L - PGV relations derived with cataloged events Jörn Groos and Joachim Ritter

30 We thank for data financing Jörn Groos and Joachim Ritter