One- and three-dimensional models of crustal structure in the vicinity of the Ramapo fault zone are derived from P-wave arrival time data. We supplement earthquake and quarry blast arrivals recorded by regional network stations with data recorded by portable seismic instruments at former network sites. The portable array data provide a critical link between data recorded on the current and former network alignments. Station corrections derived along with the one-dimensional crustal model and the three-dimensional model both indicate significant lateral velocity variations, in the range of 10 to 15 per cent, across the Ramapo fault in southeastern New York.

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