This test was conducted on Wednesday, October 7, 1998. One geophone was screwed into a nut which had been epoxied to a section of Palisades sill. The rock sample is located ~20 ft from the seismology parking lot on the west side. All tests used a trigger sensitivity of 20. Seismograms were sampled with a period of 0.03125 ms. Records are 64 ms in length. All hammer blows were to the top of the surface except were noted otherwise ______________________________________________________________ 9101- 5 hits, 0.1 m - 2.3 m distance corresponds to the file name 9123 during this test several surface variations were noticed. 9106 sat on a flaky peice of rock. Sounded different surface crack between 10 & 11 surface crack between 13 & 14 surface crack between 18 & 19 surface crack between 22 & 23 ______________________________________________________________ 9201 5 hits, 1.55 m, source on top (as above) 9202 5 hits, 1.55 m, source on side (top) 9203 5 hits, 1.55 m, source on side (5 cm down) 9204 5 hits, 1.55 m, source on side (10 cm down) 9205 5 hits, 1.55 m, source on side (15 cm down) 9206 5 hits, 1.55 m, source on side (20 cm down) 9207 5 hits, 1.55 m, source on side (25 cm down) 9208 5 hits, 1.55 m, source on side (30 cm down) CROSS SECTION <1> ------------------------|<2> |<3> |<4> |<..> ______________________________________________________________ 9301 5 hits, 40 cm, path crossed NO visible crack 9302 5 hits, 40 cm, path crossed a 1cm crack at surface MAP VIEW | C R A C K | ______________________________________________________________ 9401- single hits, 2.3 m 9430 test of repeatability for waveform, amplitude and trigger timing