PRELIMINARY STUDY OF RIETI EARTHQUAKE GROUND MOTION DATA V3

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1 Cite as: ReLUIS-INGV Workgroup (2016), Preliminary study of Rieti earthquake ground motion records V3, available at PRELIMINARY STUDY OF RIETI EARTHQUAKE GROUND MOTION DATA V3 INGV: ITACA-ESM Working Group, 1 SHAKEMAP working group. 2 ReLUIS: Iunio Iervolino ([email protected]), 3 Georgios Baltzopoulos, 4 Eugenio Chioccarelli, 4 Akiko Suzuki. 3 Warning: This report may be subjected to editing and revisions, check esm.mi.ingv.it and for updates. INDEX 1. What s New 2. Introduction 3. Geographic Information 4. Strong Motion Data 5. Data comparison with GMPE 6. Elastic and Inelastic Response Spectra 7. Comparison with the Italian seismic code Data and resources References Appendix 1 1 The ITACA-ESM Working Group is: Lucia Luzi ([email protected]); Francesca Pacor; Rodolfo Puglia; Maria D'Amico; Emiliano Russo; Chiara Felicetta; Giovanni Lanzano. INGV-Milano, Italy. 2 The SHAKEMAP Working Group is: Alberto Michelini ([email protected]); Licia Faenza; Valentino Lauciani. INGV-CNT, Italy. 3 Dipartimento di Strutture per l Ingegneria e l Architettura, Università degli Studi di Napoli Federico II, Italy. 4 Istituto per le Tecnologie della Costruzione ITC-CNR, URT Università degli Studi di Napoli Federico II, Italy.

2 1. What s New New elements of this version are: New version of intensity Shakemap using PGM to MCS conversion. Maps of strong ground motion parameters. Comparison between observed and predicted ground motion for vertical components and for M6.2. Inelastic response spectra for the horizontal components of ground motion. Data and resources section. 2. Introduction The Italian Accelerometric Network (RAN), managed by the Department of Civil Protection (DPC), and the Italian seismic network (RSN), managed by the Istituto Nazionale di Geofisica e Vulcanologia (INGV) have made available the records of the recent earthquake with epicenter located in the vicinity of Amatrice, central Italy (date 24/08/ :32 AM UTC; Mw 6.0, ref. Bollettino Sismico INGV). About 200 accelerometric signals, manually processed using the procedure by Paolucci et al (2011), are used to evaluate the peak ground motion, acceleration and displacement spectral ordinates, integral parameters and measures of duration. Corrected records and details of correction are available on the Engineering Strong-Motion database website ( The unprocessed records are available at for the RAN network and at the European Integrated Data Archive ( for the RSN, that also distributes local networks (University of Genova, University of Trieste, OGS, AMRA, among others). In order to analyze peak values and spectral acceleration (Sa or PSA), data have been processed and compared to the Ground Motion Prediction Equation (GMPE) by Bindi et al (2011) for rock and soil. The geometric mean of the horizontal components are used in the analysis. As a function of epicentral distance and for fixed spectral ordinate, the average attenuation law (and its standard deviation) have been compared with the points corresponding to the values recorded at the various stations. Moreover, Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV) and Peak Ground Displacement (PGD) are calculated for the three components and they are reported in Tables 1. Arias Intensity (I A) and Housner Intensity (or spectral intensity - SI) are the integral parameters computed for each record. Durations is computed for each record as Significant Duration estimated between 5% and 95% (D 5-95) and between 5% and 75% (D 5-75) of the I A. In Tables 2 are reported integral parameters and duration for the three directions of each record.

3 3. Geographic Information An earthquake of Mw 6.0 struck central Italy on at 01:36:32 GMT (Bollettino sismico INGV), in the vicinity of Amatrice, causing diffuse building collapse and about 270 casualties. The causative fault is normal, the prevalent style of faulting in the area. The location of the epicentre and the distribution of strongmotion stations are reported in Figure 1. Figure 2 shows the MMI shakemap of the event that includes the records published on 24/08/2016 and in the subsequent days as more data became available. The shakemap has been adjourned accordingly as more data or information (finite fault) have become available and published on the INGV Shakemap web site (Michelini et al., 2008). The shakemaps of Figure 2 provide a description of the recorded strong ground motion according to different measurables of engineering interest. The Amatrice seismic sequence struck an area where several large earthquakes occurred in the past. According to the recent historical catalog CPTI15 (Rovida et al., DBMI15/, updated to 2015) the strongest earthquake occurred on 1639 (Amatrice, Io 9-10 MCS, Mw 6.2) and destroyed the Amatrice village and its neighbourhood (Figure 3). Figure 1: location of the epicentre (yellow star) and strong motion stations within 200 km from the epicentre. The square indicate strong-motion stations and the colors correspond to the PGA values (gal).

4 a. b.

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6 e. Figure 2: Revised shakemap of the mainshock. a.) MMI intensity; b.) PGA; c.) PGV; d.) PSA 0.3 s period; d.) PSA 1.0 s period; d.) PSA 3.0 s period. (Downloaded on 8/27/2016 from f.

7 Figure 3: macroseismic field of the 1639 Mw 6.2 Amatrice earthquake (from DBMI15/) 4. Strong Motion Data The Italian Accelerometric Network (RAN), managed by the Department of Civil Protection (DPC), and the Italian seismic network, managed by the Istituto Nazionale di Geofisica e Vulcanologia (INGV) have made available the records of about 200 accelerometric stations. Appendix 1 lists networks id, station id, geographic coordinates of the station and soil type, where available. These data are also available at the Engineering Strongmotion database (esm.mi.ingv.it). The largest Peak Ground Acceleration (PGA) have been recorded at short epicentral distances (< 15 km) at the stations Amatrice (AMT, gal, uncorrected value, E-W component), Norcia (NRC, , N-S component) and Arquata del Tronto (RQT, gal, E-W component, N-S component not available). The peak parameters of the available records are reported in the following table: Table 1. Peak parameters recorded during the earthquake. For each recording station, the following is provided: station code, direction of record, distance from the epicentre (Repi), peak ground acceleration (PGA), peak ground velocity (PGV), peak ground displacement (PGD). Station Code Component R epi (km) PGA (cm/s/s) PGV (cm/s) PGD (cm) AMT E-W AMT N-S AMT Vertical NRC E-W NRC N-S NRC Vertical RM33 E-W RM33 N-S RM33 Vertical

8 SPD E-W SPD N-S SPD Vertical TERO E-W TERO N-S TERO Vertical ASP E-W ASP N-S ASP Vertical AQV E-W AQV N-S AQV Vertical SPM E-W SPM N-S SPM Vertical MNF E-W MNF N-S MNF Vertical TRE E-W TRE N-S TRE Vertical CLF E-W CLF N-S CLF Vertical FOC E-W FOC N-S FOC Vertical FOS E-W FOS N-S FOS Vertical MDAR E-W MDAR N-S MDAR Vertical TLN E-W TLN N-S TLN Vertical NCR E-W NCR N-S NCR Vertical SSM1 E-W SSM1 N-S SSM1 Vertical GAG1 E-W GAG1 N-S GAG1 Vertical MTL E-W

9 MTL N-S MTL Vertical TRE1 E-W TRE1 N-S TRE1 Vertical VAL E-W VAL N-S VAL Vertical PP3 E-W PP3 N-S PP3 Vertical MURB E-W MURB N-S MURB Vertical SSFR E-W SSFR N-S SSFR Vertical Table 2 reports some integral measures reported for the same records. Table 2. Integral measures recorded during the earthquake. For each recording station, the following are provided: station code, direction of component, Arias Intensity (I A), Significant duration estimated between 5% and 95% of the I A (D 5-95), Significant duration estimated between 5% and 75% of the I A (D 5-75), spectral intensity (Housner intensity) between 0.10 and 2.5 s (SI). Station Component I Code A (cm/s) D 5-95 (s) D 5-75 (s) SI (cm) AMT E-W AMT N-S AMT Vertical NRC E-W NRC N-S NRC Vertical RM33 E-W RM33 N-S RM33 Vertical SPD E-W SPD N-S SPD Vertical TERO E-W TERO N-S TERO Vertical ASP E-W ASP N-S ASP Vertical AQV E-W AQV N-S AQV Vertical

10 SPM E-W SPM N-S SPM Vertical MNF E-W MNF N-S MNF Vertical TRE E-W TRE N-S TRE Vertical CLF E-W CLF N-S CLF Vertical FOC E-W FOC N-S FOC Vertical FOS E-W FOS N-S FOS Vertical MDAR E-W MDAR N-S MDAR Vertical TLN E-W TLN N-S TLN Vertical NCR E-W NCR N-S NCR Vertical SSM1 E-W SSM1 N-S SSM1 Vertical GAG1 E-W GAG1 N-S GAG1 Vertical MTL E-W MTL N-S MTL Vertical TRE1 E-W TRE1 N-S TRE1 Vertical VAL E-W VAL N-S VAL Vertical PP3 E-W PP3 N-S PP3 Vertical MURB E-W

11 MURB N-S MURB Vertical SSFR E-W SSFR N-S SSFR Vertical Figures 4 to 8 are the maps showing the spatial distribution of the peak ground values Figure 4. Map of the Peak Ground Acceleration (maximum between horizontal components, in cm/s 2 ). The star indicates the epicenter of the mainshock

12 Figure 5. Map of the Peak Ground Velocity (maximum between horizontal components, cm/s). The star indicates the epicenter of the mainshock

13 Figure 6. Map of the Peak Ground Displacement (maximum between horizontal components, cm). The star indicates the epicenter of the mainshock Figure 7. Map of the Arias Intensity (maximum between horizontal components, cm/s). The star indicates the epicenter of the mainshock

14 Figure 8. Map of the significant duration (maximum between horizontal components, s). The star indicates the epicenter of the mainshock 5. Data comparison with GMPE Some GM parameters (PGA, PGV and acceleration spectral ordinates at 0.3, 1 and 3 seconds, period used to calculate shakemaps) are compared to the predictions by Bindi et al (2011). These results can be considered as preliminary since: the distance is the epicentral distance, whilst Bindi et al. adopts the Joyner-Boore distance; the latter could not be estimated because the fault geometry is still not available. the comparison at 3s is outside the range of validity of this GMPE, that can be used until 2s. We calculated the prediction for: PGA, PGV, SA at 0.3s, 1s and 3s for the geometric mean of the horizontal components and the vertical component at two different moment magnitudes, 6.0 and a 6.2. For the vertical component, the SA at 3s was not implemented by Bindi et al (2011), therefore we evaluated the goodness of fit with the prediction at 2s. Figures 9-17 show the results for Mw 6.0, while Figure show the results for Mw 6.2.

15 Figure 9: Observed horizontal PGA against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 10: Observed horizontal PGV against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

16 Figure 10: Observed horizontal SA (0.3s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 11: Observed horizontal SA (1s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

17 Figure 12: Observed horizontal SA (3s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 13: Observed vertical PGA against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

18 Figure 14: Observed vertical PGV against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 15: Observed vertical spectral acceleration at 0.3s against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

19 Figure 16: Observed vertical spectral acceleration at 1s against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 17: Observed vertical spectral acceleration at 2s against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

20 Figure 18: Observed horizontal PGA against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 19: Observed horizontal PGV against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

21 Figure 20: Observed horizontal spectral acceleration (0.3s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 21: Observed horizontal spectral acceleration (1s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

22 Figure 22: Observed horizontal spectral acceleration (3s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 22: Observed vertical PGA against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

23 Figure 23: Observed vertical PGV against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 24: Observed vertical spectral acceleration (0.3s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites

24 Figure 25: Observed vertical spectral acceleration (1s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites Figure 26: Observed vertical spectral acceleration (2s) against Bindi et al (2011): left EC8 A and B sites; right EC8 C and D sites 6. Elastic and Inelastic Response Spectra In this section, elastic and inelastic response spectra of the recorded ground motions are provided. With regard to elastic response the pseudo-spectral acceleration (PSA), pseudo-spectral velocity (PSV) and spectral displacement (SD) are reported for all the available records for three different values of damping ratio, (z), that is 2%, 5% and 10%. Additionally, constant-strength inelastic displacement ratios (C R ratio of inelastic to elastic displacement response) are provided for the horizontal components of ground motion. These spectra were

25 calculated for 5% damped, elastic-perfectly plastic oscillators and are reported at three values of reduction factor (R ratio of elastic response spectral acceleration to yield spectral acceleration), R=2,4,6.

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61 7. Comparison with the Italian seismic code The pseudo-acceleration response spectra associated to the horizontal ground motions recorded by the four stations with lowest epicentral distance (AMT, NRC, RM33 and SPD) are compared with the elastic spectra provided by the Italian seismic code (NTC2008) at the corresponding sites for soil class provided in Appedix 1 and four different return periods (T R): 50, 475, 975 and 2475 years. Note that comparison of individual earthquake recordings with probabilistic hazard is a delicate issue and no direct conclusions can be drawn (see Iervolino, 2013) Data and resources Manually Processed and unprocessed strong-motion records Engineering strong-motion database: Automatically processed and raw strong-motion records Rapid response Strong Motion database Raw strong-motion records European Integrated Data Archive Italian Department of Civil Protection: Shakemaps Italy ShakeMaps Real time earthquake catalogue

62 ISIDe - Italian Seismological Instrumental and Parametric Database Historical catalogue Catalogo Parametrico dei Terremoti Italiani Macroseismic data Database macrosismico Italiano References Bindi, D., F. Pacor, L. Luzi, R. Puglia, M. Massa, G. Ameri, and R. Paolucci (2011). Ground motion prediction equations derived from the Italian strong motion database, Bull. Earthq. Eng. 9, Iervolino I. (2013) Probabilities and fallacies: why hazard maps cannot be validated by individual earthquakes. Earthquake Spectra, 29(3): Michelini, A., Faenza, L., Lauciani, V., & Malagnini, L. (2008). ShakeMap implementation in Italy. Seismological Research Letters, 79(5), Paolucci, R., F. Pacor, R. Puglia, G. Ameri, C. Cauzzi, and M. Massa (2011). Record processing in ITACA, the new Italian strong motion database, in Earthquake Data in Engineering Seismology, Geotech- nical, Geological and Earthquake Engineering Series, S. Akkar, P. Gulkan, and T. Van Eck (Editors), Vol. 14(8), Appendix 1 Stations highlighted in gray are not used in the analysis net_co de station_co de ec8_co de st_latitu de st_longitu de BA PZUN B* FR SMPL A* IT 0CAN IT AMT B* IT ANB B* IT ANT A* IT AQF B* IT AQK B IT AQV B IT ASP C* IT ATN A* IT AVL C* IT AVZ C IT BCN C* IT BGR B* IT BNE C* IT BRS A* IT BSS B* IT BTT2 D IT BVG C IT BZZ B

63 IT CCT C* IT CER B* IT CLF D IT CLN B* IT CMB B* IT CME A* IT CPS B IT CRP C* IT CSA C* IT CSD B IT CSN B IT CSO1 B* IT CSS B IT CTD B* IT CTS C* IT CVM A* IT DUR B* IT FAZ C IT FBR C* IT FIE B* IT FMG A* IT FOC C* IT FOS B* IT FRT IT FSS C* IT GBB B* IT GBP C IT GNU A* IT GRN A* IT GSA B IT LSS A IT MCR C* IT MCS B* IT MLF B IT MMP1 B* IT MNF A* IT MNG A* IT MNT A* IT MTL B IT NAP C* IT NCR E IT NRC B IT NRN A* IT ORP B IT PAN B* IT PGG B* IT PNC B* IT PNN C IT PSC A IT PTI B* IT PTL B* IT PVF B* IT PZI1 B* IT RDG A* IT RQT B* IT RTI D

64 IT SAG A* IT SBC A IT SCF B* IT SDM A* IT SGMA B* IT SGPA B IT SGPA B IT SGSC B* IT SGSC B* IT SIG C* IT SNG C IT SNI B* IT SNM B* IT SNS1 C* IT SOR IT SPD B* IT SPM A* IT SPO IT SSC E IT SSG B* IT SSO IT STF B* IT SUL A* IT SULA C* IT SULC C* IT SULP B* IT TLN B* IT TOD A* IT TRE C* IT TRL A* IT TRN1 D* IT TRV B* IT TSC A* IT TVL B* IT UMB B* IT VAL B* IT VLL B* IT VLN C* IT VNF1 C* IT VSE B* IV ACER B* IV APEC B* IV APRC IV ASOL A* IV ATCC B* IV ATFO B* IV ATLO B* IV ATPC B* IV ATTE A* IV ATVO B* IV BDI B* IV BIOG B* IV BOB B* IV BRIS B* IV BSSO A* IV CADA B*

65 IV CAFE A* IV CDCA C* IV CERA A* IV CIMA B* IV CMPO C* IV COR1 B* IV CPGN B* IV CRMI B* IV CRND C* IV CTL8 C* IV FAEN C* IV FERS C IV FIU1 B* IV FOSV B* IV FRE8 A* IV GAG1 B* IV GATE B* IV GUMA B* IV IMOL C* IV LEOD C* IV MCEL A* IV MDAR B* IV MELA A* IV MGAB A* IV MGR B* IV MNTV C* IV MOCO B* IV MODE C* IV MRB1 B* IV MRLC B* IV MSAG A* IV MTRZ B* IV MURB B* IV NDIM C* IV NEVI B* IV NRCA B* IV OPPE C* IV ORZI C* IV OSSC B* IV PAOL A* IV PCRO B* IV PIEI A* IV PIGN A* IV POFI A* IV PP3 C* IV PTRJ A* IV RM33 B* IV RNI2 A* IV ROM9 B* IV ROVR A* IV SACS B* IV SALO A* IV SANR C* IV SBPO C* IV SERM C* IV SGG A*

66 IV SGTA B* IV SIRI B* IV SNAL A* IV SNTG A* IV SSFR A* IV SSM1 B* IV STAL B* IV TERO B* IV TRE1 B* IV TREG C* IV TRIV B* IV VAGA A* IV VENL D* IV VITU A* IV VOBA C* IV VULT B* IV ZCCA B* IV ZEN8 A* IV ZOVE B* MN AQU B* MN BLY MN CUC A* MN VLC A* OX ACOM OX AGOR OX CGRP OX CIMO OX CLUD OX MPRI OX SABO B* OX VARN OX ZOU ST DOSS ST VARA A*