Can growth strata identify individual paleoearthquakes and characterize fold kinematics?
• A large, damaging earthquake in 1944 on a blind thrust fault caused 60 cm of surface rupture on the subsidiary La Laja fault and additional unmeasured growth of an associated backlimb fold. Both the fold and fault are components of the La Laja Fault System (LLFS) located 25 km northeast of San Juan, Argentina. Deformed, syntectonic growth strata were investigated in detail to determine whether such units preserve evidence of individual paleoearthquakes. The objective of this study is to provide a clearer understanding of the signal of fold growth on short timescales, and show the extent to which growth strata can provide value in deducing the paleoseismic record of thrust tectonic regimes. Two large (50 m x 6 m x 7 m) trenches were excavated within and outside of active drainages to 1) analyze stratigraphic geometries to determine the mechanism of fold growth, and 2) compare the deformational history contained within the growth strata with fold growth in an historic earthquake and wi
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