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Line passes over caldera and very near instrument. Odd features in the water wave near 3960. Irregular topography is clear but so are crossing parabolas near 3 seconds puzzling realignment of phases near sh.3900 (16 km). Very clear on 2-12 Hz bpf. Lots of things going on in this record. Interesting <'s and >'s between 3850 and 3900. first arrival appears to have shadow zone like feature at sh. 3890 (18 km) tt slope at 3840 too great to be a result of topography |