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unomaha.edu

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unmc.edu

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library.northeastern.edu

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ecommons.cornell.edu

These data are from Laboratory Earthquake Experiments from the Cornell 0.76 m apparatus in support of the following research: To investigate the effect of a normal stress heterogeneity on radiated spectra, we utilized a PMMA laboratory fault with a single, localized bump. By varying the bump prominence (defined here as normal stress on the bump divided by average normal stress across the entire fault), we produced earthquake-like ruptures that ranged from smooth, continuous ruptures to complex ruptures with variable rupture propagation velocity, slip distribution, and stress drop. High prominence bumps produced complex events that radiated more high frequency energy, relative to low frequency energy, than continuous events without a bump. In complex ruptures, the high frequency energy showed significant spatial variation correlated with peak slip rate and maximum local stress drop. Continuous ruptures emitted spatially uniform bursts of high frequency energy. Near-field peak ground acceleration (PGA) measurements of complex ruptures show nearly an order-of-magnitude higher PGA near the bump than elsewhere. We propose that for natural faults, geometric heterogeneities may be a plausible explanation for commonly observed order-of-magnitude variations in near-fault PGA.

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lib.kobe-u.ac.jp

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pearsonhighered.com

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