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 www.kit.edu
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 2 11.12.2012 Jörn Groos and Joachim Ritter
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 2.4 3 11.12.2012 Jörn Groos and Joachim Ritter
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 2.4 4 11.12.2012 Jörn Groos and Joachim Ritter
Landau and Insheim: Seismic monitoring in 2009 5 11.12.2012 Jörn Groos and Joachim Ritter
Landau and Insheim: Seismic monitoring in 2009 6 11.12.2012 Jörn Groos and Joachim Ritter
Landau and Insheim: Seismic monitoring today 7 11.12.2012 Jörn Groos and Joachim Ritter
Landau and Insheim: Seismic monitoring today 8 11.12.2012 Jörn Groos and Joachim Ritter
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 2.4 9 11.12.2012 Jörn Groos and Joachim Ritter
Landau: Absolute (re)localisation of events with M L > 0.6 Poster Jens Zeiß 10 11.12.2012 Jörn Groos and Joachim Ritter
Landau: Absolute (re)localisation of events with ML > 0.6 11 11.12.2012 Jörn Groos and Joachim Ritter
Event detection Example: Landau M L 2.7 2009-08-15 12:10:51.920 epicentral distance 6 km 12 11.12.2012 Jörn Groos and Joachim Ritter
Event detection Example: Landau M L 2.7 2009-08-15 12:10:51.920 epicentral distance 6 km 13 11.12.2012 Jörn Groos and Joachim Ritter
norm. ampl. norm. ampl. norm. ampl. Event detection: High waveform similiarity Z CC 0.53 N CC 0.75 E CC 0.73 0.58 mm/s M L ~0.3 0.003 mm/s 14 11.12.2012 Jörn Groos and Joachim Ritter
norm. ampl. norm. ampl. norm. ampl. Event detection: Low waveform similarity Z CC 0.17 N CC 0.52 E CC 0.72 0.58 mm/s M L ~0.5 0.005 mm/s 15 11.12.2012 Jörn Groos and Joachim Ritter
Detected seismic events: July 2009-November 2012 Insheim Landau 2009 2010 2011 2012 16 11.12.2012 Jörn Groos and Joachim Ritter
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 17 11.12.2012 Jörn Groos and Joachim Ritter
Peak Ground Velocities (PGV) over M L 18 11.12.2012 Jörn Groos and Joachim Ritter
PGVs in the Landau area: A M L 1.9 event 19 11.12.2012 Jörn Groos and Joachim Ritter
Perceptibility (DIN 4150) TMO50 M L 2.7 Epicentral distance ~1 km TMO50 M L 1.3 Epicentral distance ~1 km Time in seconds 20 11.12.2012 Jörn Groos and Joachim Ritter
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 21 11.12.2012 Jörn Groos and Joachim Ritter
Vibration intensities (DIN 4150) over M L 22 11.12.2012 Jörn Groos and Joachim Ritter
Perceptibility in the Landau area: A M L 1.9 event 23 11.12.2012 Jörn Groos and Joachim Ritter
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. 2006. ML Determination for Local and Regional Events Using a Sparse Network in Southwestern Germany. Journal of Seismology, 10, 247-257. 24 11.12.2012 Jörn Groos and Joachim Ritter
Determination of M L in accordance to the LED 25 11.12.2012 Jörn Groos and Joachim Ritter
Determination of M L in accordance to the LED 26 11.12.2012 Jörn Groos and Joachim Ritter
Determination of M L in accordance to the LED Landau earthquake 2011-10-31 06:18:25 UTC M L LED 1.9 ± 0.1 M L Station 1.8 26 stations avg. 1.81 std. 0.15 27 11.12.2012 Jörn Groos and Joachim Ritter
Determination of M L in accordance to the LED 28 11.12.2012 Jörn Groos and Joachim Ritter
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 29 11.12.2012 Jörn Groos and Joachim Ritter
We thank for data financing 30 11.12.2012 Jörn Groos and Joachim Ritter