Japan Geoscience Union Meeting 2015

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Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS21] Planetary Sciences

Sun. May 24, 2015 11:00 AM - 12:45 PM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Kosuke Kurosawa(Planetary Exploration Research Center, Chiba Institute of Technology), Keiko Hamano(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Chair:Shunichi Kamata(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Shintaro Azuma(Department of Earth and Planetary Sciences System,Hiroshima university)

11:45 AM - 12:00 PM

[PPS21-10] Impact velocity dependence of transient crater growth in granular targets

*Satoru YAMAMOTO1, Sunao HASEGAWA2, Ayako SUZUKI2, Tsuneo MATSUNAGA1 (1.NIES, 2.JAXA)

Keywords:impact crater, impact experiment, scaling law, gravity regime

In this study, we developed a new method for direct observations of transient crater growth in granular targets using a laser profiler. This method allows us to measure the excavation cavity in the transient crater growth at a temporal resolution of ~1 ms without using a high-speed video camera. Using a vertical two-stage light gas gun at JAXA, we conducted impact cratering experiments onto granular targets. Using the laser profiler, we successfully obtained the time expansion data of the excavation cavity for the impact velocities ranging from ~0.8 km/s to 6 km/s. Based on these new data for the transient crater growths, we discuss how the scaling law for impact cratering in the gravity regime depends on impact velocity.