Subsurface pulse, crater and ejecta asymmetry from oblique impacts into granular media

Abstract

We carry out experiments of 104 m/s velocity oblique impacts into a granular medium (sand). Impact craters have nearly round rims even at a grazing angle of about $10^{\circ }$, however, the strength of seismic pulses excited by the impact is dependent upon impact angle, and the ratio between uprange and downrange velocity peaks can be as large as 5, particularly at shallow depths. Crater slope, an offset between crater center and impact site, crater volume, azimuthal variation in ejection angle, seismic pulse shapes and subsurface flow direction are also sensitive to impact angle, but to a much lower degree than subsurface pulse strength. Uprange and downrange pulse peak amplitudes can be estimated from the horizontal and vertical components of the momentum imparted to the medium from the projectile

arXiv comment28 pages, 22 figures

References in corpus (12)

• Scaling forces to asteroid surfaces: The role of cohesion
• Scaling and dynamics of sphere and disk impact into granular media
• The Geology and Geophysics of Kuiper Belt Object (486958) Arrokoth
• Ricochets on Asteroids: Experimental study of low velocity grazing impacts into granular media
• Scaling laws for the oblique impact cratering on an inclined granular surface
• Velocity field and cavity dynamics in drop impact experiments
• Impact cratering mechanics: A forward approach to predicting ejecta velocity distribution and transient crater radii
• Propagation and attenuation of pulses driven by low velocity normal impacts in granular media
• Ricochets on Asteroids II: Sensitivity of laboratory experiments of low velocity grazing impacts on substrate grain size
• Surface particle motions excited by a low velocity normal impact into a granular medium
• Dynamics of oblique impact in a photoelastic granular medium
• Froude number scaling unifies impact trajectories into granular media across gravitational conditions