exsim – modifications

UPStrat-MAFA 3rd General MeetingSelfoss, Iceland, 23-26 July 2013 AREA 3

Modifications to EXSIM code to allow for multiple site amplifications curves

and random variation of source parameters

Horst Langer, INGV-Catania, ItalyMariano Garcia-Fernandez, IGEO (CSIC,UCM), Spain


EXSIM – Modifications1) Two shear wave velocities, one related to the source volume, one used for

geometrical spreading

2) Calculation of Housner Intensity

3) Magnitude and stress parameter can be varied randomly

4) Site amplification can be specified for each indivual site (instead of a generic correction valid for all sites in the original version)

5) Radiation pattern and shear wave velocity can be adjusted for each single site

6) New Output files *stat.out and *resp.out (report min and max values of simulated GM parameters and Housner Intensity, together with distances and cartesian coordinates of each site. The *resp.out* reports full response spectra)


!Input file for program EXSIM12!Title EXSIM12 & DMB test!Write acc, psa, husid files for each site? Y!MW, Stress, Mvar, Stress_var (log), flag (0=fmax; 1=kappa), fmax or kappa 6.5 130.0 0.0 0.0 0 15.0!lat and lon of upper edge of fault 0.0 0.0!strike,dip, depth of fault 0.0 90.0 3.0………………………………………………………………………..


Example for new site amplification file3 0.9 1.0 ! nfrequencies, corr. beta, radpat1.0 1.0 ! frequency, amplification3.12 5.23 ! frequency, amplification14.77 1.0 ! frequency, amplification1 1.1 1.0 ! nfrequencies, corr. beta, radpat1.0 1.0 ! frequency, amplification1 1.1 1.2 ! nfrequencies, corr. beta, radpat1. 1.0 ! frequency, amplification


Application of EXSIM for Spain case: Area 3 (SE Spain)

Mariano García-Fernández, IGEO (CSIC,UCM), SpainMaría-José Jiménez, IGEO (CSIC,UCM), Spain


White stars: I-EMS98 ≥ V-VIRed stars: I-EMS98 ≥ VIIGrey circles: IGN Catalogue (1048-2012)


Red circles: Calibration events. M3.3-5.2White triangles: accel. stations. < 100 km


parameter value referencescrustal S-wave velocity 3.25 km/s

Carbonell et al. (1998); Corchete & Chourak (2011).crustal density 2.65 g/cm3

kappa 0.03 Boore & Joyner (1997); Limited data fit

geometric spreading R-1 (R ≤ 65km)R-0.5 (R > 65km) Mancilla et al. (2008)

Q(f) 100 f0.6 García-Fernández & Canas (1992)

distance dependent duration T0 + 0.1R Beresnev & Atkinson (2002)

windowing function Saragoni-Hart Beresnev & Atkinson (2002)rupture propagation 0.8 VS Beresnev & Atkinson (2002)

slip distribution Random Atkinson et al. (2011)pulsing area

percentage 50% Atkinson et al. (2011)

minimum duration 10 s Empirical estimation

crustal amplification ENA generic rock Atkinson and Boore (2006)

site amplification H/V analysis Single-station EHV; (Garcia-Fernandez & Jimenez, 2012)


Area 3: Soil characterization in Vega Baja


Area 3: Soil characterization in Lorca


Area 3Vega Baja

02/03/2008 05/02/2012

parameter earthquake 02/ 03/ 2008 05/ 02/ 2012

fault strike (°) 298 fault dip (°) 73

fault dimensions L×W (km) 0.6 × 0.6 depth to fault upper edge (km) 3.9

Mw 3.5 3.3 stress parameter 250 subfault size (km) 0.3 × 0.3


Area 3Lorca

02/02/1999

06/08/200229/01/2005

Parameter earthquake

02/ 02/ 1999 06/ 08/ 2002 29/ 01/ 2005

fault strike (°) 41 119 132 fault dip (°) 69 68 85

fault dimensions L×W (km) 2.5 × 2.5 3 × 3 2.5 × 2.5 depth to fault upper edge

(km) 4.1 7.5 9.6

Mw 4.8 5.0 4.8 stress parameter 150 140 150 subfault size (km) 0.5 × 0.5 1 × 1 0.8 × 0.8


Area 3Lorca

May 2011 series

parameter 11 May 2011 Lorca earthquakes

15:05:13 16:47:25 20:37:45

fault strike (°) 247 240 216 fault dip (°) 46 54 63

fault dimensions L×W (km) 2 × 2 4 × 3 1 × 1 depth to fault upper edge

(km) 3.9 3.4 4.8

Mw 4.6 5.2 3.9 stress parameter 70 150 180 subfault size (km) 0.5 × 0.5 1 × 1 0.5 × 0.5

16:47:25

exsim – modifications

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