Ultra-thin clay layers facilitate seismic slip in carbonate faults
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1 Ultra-thin clay layers facilitate seismic slip in carbonate faults Luca Smeraglia 1, Andrea Billi 2, Eugenio Carminati 1,2, Andrea Cavallo 3, Giulio Di Toro 4,5,6, Elena Spagnuolo 5, and Federico Zorzi 6 1 Dipartimento di Scienze della Terra, Sapienza University of Rome, Italy. 2 Consiglio delle Nazionale Ricerche, IGAG, Rome, Italy 3 CERTEMA, Multidisciplinary technology laboratory, Cinigiano, Grosseto, Italy 4 School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, United Kingdom 5 INGV, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy 6 Dipartimento di Geoscienze, Padova University, Italy Luca Smeraglia*(corresponding author): luca.smeraglia@uniroma1.it Andrea Billi: andrea.billi@cnr.it Eugenio Carminati: eugenio.carminati@uniroma1.it Andrea Cavallo: a.cavallo@laboratoriotecnologicogrosseto.it Giulio Di Toro: giulio.ditoro@manchester.ac.uk Elena Spagnuolo: elena.spagnuolo@ingv.it Federico Zorzi: federico.zorzi@unipd.it 1
2 Supplementary Fig. S1. Powder X-ray diffraction (XRPD) traces of the insoluble residue from the ultracataclasite Diffraction peaks showing the occurrence illite, smectite and kaolinite within the insoluble residue (~1.5% wt.) from the ultracataclasite. 2
3 Supplementary Fig. S2. Powder X-ray diffraction (XRPD) traces of the insoluble residue from the phyllosilicate-bearing layer within the ultracataclasite. Diffraction peaks showing the occurrence illite, smectite, kaolinite, and quartz within the insoluble residue (~8.6% wt.) from the phyllosilicate-bearing layer within the ultracataclasite. 3
4 Supplementary Fig. S3. Pre-shear configuration of dry layered experiment. (a) FE-SEM image showing microstructures of pre-shear configuration of dry layered experiment. EDS maps showing any silica (b) and aluminum (c) concentration along the phyllosilicate-rich layer. Silica and aluminum are indicative of the presence of phyllosilicate. 4
5 Location Earthquake Date Slip Type Magnitude Surface rupture length (km) Surface displacement (m) Greece Sparta N Turkey Menderes 22/02/1653 N Iran Vostiza 26/12/1861 N Greece Fokis 01/08/1870 N Greece Civril 03/05/1875 N Turkey Emiralan 29/07/1880 N Turkey Banaz 30/09/1887 N Turkey Martin 27/04/1894 N Greece Mender 20/09/1899 N Turkey Struma 4/4/1904 N Bulgaria Scutari 1/6/1905 N Albania Marmara 9/8/1912 NR Turkey Burdur 3/10/1914 NR Italy Avezzano 13/1/1915 N USA Pleasant Valley 3/10/1915 N Kenya Laikipia 1/6/1928 N Turkey Plovdiv 14/4/1928 N Bulgaria Papazili 18/4/1928 N Iran Ieriss 26/9/1932 N Greece Saphane 25/6/1944 NR Peru Ancash 10/11/1946 N USA Fort Sage Mtns. 14/12/1950 N Turkey Sofades 30/4/1954 N USA Rainbow Mountain 6/7/1954 N USA Stiliwater 24/8/1954 N Greece Velestin 8/3/1957 NL USA Hebgen Lake 18/8/1959 N Greece Manyas 16/10/1964 NR Turkey Megalop. 1/9/1966 N Greece Acarnania 29/10/1966 N Greece Debar 30/11/1967 NL Turkey Alasehir Valley 28/3/1969 N Turkey Gediz 28/3/1970 N Turkey Burdur 12/5/1971 N USA Oroville 1/8/1975 N-RL Greece Thessaloniki 20/6/1978 N Turkey Volvi 20/6/1978 N Greece Almyros 9/7/1980 N Italy South Apennines 23/11/1980 N Greece Corinth 25/2/1981 N Greece Corinth 4/3/1981 N Yemen Dhamer 13/12/1982 N USA Borah Peak 28/10/1983 N-LL Peru Cuzco 5/4/1986 N Greece Kalamata 13/9/1986 N New Zealand Edgecumbe 2/3/1987 N USA Eureka Valley 17/5/1993 N Greece Kozani 13/5/1995 N Turkey Dinar 1/10/1995 NR Italy L'Aquila 7/4/2009 N Mexico El Mayor-Cucapah 4/4/2010 N Supplementary Table S1. Non-exhaustive list of onshore extensional fault earthquakes, which caused surface displacement. Historical and instrumental extensional fault earthquakes that generated surface faulting up to about six meters of vertical displacement in different regions worldwide (e.g., Wells and Coppersmith, 1994; Ambraseys and Jackson, 1998; Martino et al., 5
6 2014). *E = extensional; RL = right lateral; LL = left lateral. For earthquakes with an oblique component of slip, the subordinate sense of slip is listed after the primary slip type. 6
7 Lithology Quartz (%) K-feldspar (%) Plagioclase (%) Dolomite (%) Calcite (%) Clay minerals (%) Ultracataclasite Phyllosilicate-rich layers (ultracataclasite) Cataclasite Syn-orogenic deposit (Hemipelagic marls) Syn-orogenic deposit (Siliciclastic sandstones) Supplementary Table S2. Powder X-ray diffraction (XRPD) mineralogical composition of natural fault rocks and tested materials. The ultracataclasite consists of calcite (98.5% wt.) and clay minerals (1.5% wt.). Phyllosilicate-bearing layers consist of calcite (93% wt.), quartz (2% wt.), and clay minerals (5% wt.). The foliated cataclasite consists solely of calcite (100% wt.). Siliciclastic sandstones (Syn-orogenic deposits) consist of quartz (24%), k-feldspar (3%), plagioclase (11%), dolomite (11%), calcite (16%), pyrite (1%), muscovite/illite (21%), chlorite (9%), serpentine (3%), and non quantifiable low amount of smectite and kaolinite. Hemipelagic marls (Syn-orogenic deposits) consist of of quartz (16%), plagioclase (5%), dolomite (3%), calcite (32%), Mg-calcite (21%), muscovite/illite (12%), chlorite (4%), kaolinite (3%), serpentine (4%), and non quantifiable low amount of smectite. 7
8 wt% Phyllosilicates Detrital Mica Plagioclase (albite) K-feldspar Quartz Na 2 O MgO Al 2 O SiO K 2 O CaO TiO MnO Fe 2 O sum Supplementary Table S3. Average EDS composition of the non-carbonate minerals within the ultracataclasite. Results show the occurrence of phyllosilicates, detrictal mica (mainly illite/muscovite), plagioclase, K-feldspar, and quartz. The chemical data suggest that phyllosilicates and detrital mica are an assemblage of muscovite, illite, chlorite, and smectite. 8
9 Number of experiment Type of experiment Velocity (m/s) Normal stress (MPa) Distance to the onset of dynamic weakening (m) Steady state friction Fracture energy (MJ/m 2 ) 1146 Dry Layered Dry Random Dry Carbonate Wet Layered Wet Random Wet Carbonate Dry Layered Dry Random Dry Carbonate Wet Layered Wet Random Wet Carbonate Total displacement (m) Supplementary Table S4. Summary of experimental conditions and mechanical results of friction experiments. 9
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