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Download PDF by H. M. Iyer (auth.), Chi-Yu King, Roberto Scarpa (eds.): Modeling of Volcanic Processes

By H. M. Iyer (auth.), Chi-Yu King, Roberto Scarpa (eds.)

ISBN-10: 3322894142

ISBN-13: 9783322894144

ISBN-10: 3528089946

ISBN-13: 9783528089948

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The velocity perturbations for layer 2 (15-30 km depth), shows a broader low-velocity anomaly than in the first layer with a maximum velocity decrease of about 8 % and its center shifted to the west of the line joining Mt. Hannah and The Geysers. The velocity anomaly is still clearly discernible in layer 3 (30-45 km depth) as a broad north-south elongated feature to the west of Mt. Hannah and The Geysers. The velocity perturbations in layer 4 (4560 km) are statistically insignificant and are mainly the result of spillovers from blocks above.

Using data from a crustal refraction survey centered on the caldera (Hill, 1976), traveltime corrections were made for the upper 6 km of the crust. The corrected relativeresidual data were modeled primarily along the northwest-southeast azimuth, using a simple ray-tracing techniques assuming velocity decreases of 10 and 15% (Figure 9a). The heavy segments of the ray paths in figure 9a are proportional in length to the delay seen by the rays. Additional models with greater velocity contrasts could undoubtedly be constructed without developing inconsistencies in the data.

1976) indicate that the LV magma chamber must have been replenished to have sutained volcanism for more than a million years. Any plausible model for magma genesis in the LV-Mono Craters region should therefore start with deep lithospheric magma sources. The qualitative model for LV magma chamber presented here lacks the detail and resolution at depth to infer the nature of this deep magma source. Note that in some of the other models, such as, for the Clear Lake region, Coso Mountains, and Mineral Mountains summarized elsewhere in this paper, there is some indication that the crustal magma chambers may be connected to mantle sources.

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Modeling of Volcanic Processes by H. M. Iyer (auth.), Chi-Yu King, Roberto Scarpa (eds.)


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