Planetary rovers are increasingly challenged to negotiate extreme terrain. Early destinations have been benign to preclude risk, but canyons, funnels, and newly discovered holes present steep slopes that defy tractive descent. Steep craters and holes with unconsolidated material pose a particularly treacherous danger to modern rovers. This research explores robotic braking by plowing, a novel m...

an important concern in rock mechanics is non-homogeneity as joints or fault. adopting the joints as fractures, fractures are well known for their effects on the mechanical and transport properties of rock. it has been postulated that through fractured/jointed rock, mainly, the polygons turned to the shear vector (ti) are involved in the mobilization of shear resistance. consequently, in order ...

A high fidelity field test of a four-wheeled lunar micro-rover, code-named Moonraker, was conducted by the Space Robotics Lab at a lunar analog site in Hamamatsu Japan, in cooperation with Google Lunar XPRIZE Team Hakuto. For the target mission to a lunar maria region with a steep slope, slippage in loose soil is a key risk; a prediction method of the slip ratio of the system based on the angle...

The mechanisms by which Cordilleran plutons are emplaced vary widely. However, the present authors have examined a series of plutons ranging from 2–35 km emplacement depth that have many common features, which suggest that downward transport of host rock is the most important mechanism during magma ascent and pluton emplacement. Many of these Cordilleran plutons preserve gently dipping, unfault...

Abstract The Matano fault in central Sulawesi is one of the major strike-slip faults that accommodate rapid left-lateral slip between Pacific and Australian plates. has a high seismic potential producing large (M w ≥7) earthquakes. However, was less studied, unlike Palu-Koro fault. This paper presents preliminary results our active investigation eastern which may help understanding neotectonics...

Abstract To guide future exploration, this predominantly field based study has investigated the structural evolution of central Kiruna area, type locality for iron oxide-apatite deposits that stands a significant amount European ore production. Using combination geologic mapping focusing on structures and stratigraphy, petrography with focus microstructures, X-ray computed tomography imaging su...

Abstract Mw 7.6 and 7.4 earthquakes occurred 16 h apart on April 12 13, 2014, at depths of 15 km 35 km, respectively, southwest Makira Island (San Cristobal) in the Solomon Islands. We study source mechanisms to investigate interrelation between two events, why Islands have a historically high rate doublet earthquakes. Teleseismic P waveform data for both events were used obtain slip distributi...

We investigated rupture geometry, size, and slip distribution of October 30, 2020, Samos (Sisam)-Kuşadası earthquake combining seismographs, GPS measurements, SAR analysis. Right after the earthquake, we measured 13 additional campaign-based sites to intensify available network consisting 10 continuous stations. combined all seismographs have best possible accuracy for mainshock aftershock hypo...

Observed crest speeds of maximally steep, breaking water waves are much slower than expected. Our fully nonlinear computations of unsteadily propagating deep water wave groups show that each wave crest approaching its maximum height slows down significantly and either breaks at this reduced speed, or accelerates forward unbroken. This previously noted crest slowdown behavior was validated as ge...