Lunar topographic data revealed a large population of large impact basins not previously recognized by standard photogeologic mapping. Crustal thickness model data reveal the presence of even more. The total number of lunar basins > 300 km diameter may exceed 150, more than 3 times that determined by photogeologic mapping alone. Introduction: Photogeologic mapping suggested the cumulative numbe...

A simplified model of earth structure based on the Nd and Sr isotopic characteristics of oceanic and continental tholeiitic flood basalts is presented, taking into account the motion of crustal plates and a chemical balance for trace elements. The resulting structure that is inferred consists of a lower mantle that is still essentially undifferentiated, overlain by an upper mantle that is the r...

iran is located between two lithospheric plates (euroasia, arabian) and these two plates converge toward each other with a velocity of 25 mm/yr rate. shortening that produced from this convergence with makran subductin shows faulting and folding in zagros orogenic belt, alborz and kopedagh in north and sliding in sum strike slip faults with north-south trend in central iran. the nw-se trending ...

S U M M A R Y The structure of the oceanic crust conforms in general to a very simple model. However, fine-scale variations of this structure in anomalous regions (such as beneath oceanic islands) remain poorly resolved. Here we examine teleseismic receiver functions (RFs) computed at four permanent broadband seismic stations on islands in the Pacific region. The RF method is ideal for examinin...

Teleseismic receiver functions are used to estimate the crustal structure beneath a 36-station, 500-km-long, NW oriented linear array centered on the eastern Snake River Plain and crossing the Yellowstone hotspot swell 250 km SW of Yellowstone. Structure derived previously for this region from wide-angle reflection data is used as an initial model, and ffiis structure explains most features obs...

Abstract. In an effort to improve our understanding of the seismic character crust beneath southeast Australia and how it relates tectonic evolution region, we analyse teleseismic earthquakes recorded by 24 temporary 8 permanent broadband stations using receiver function method. Due proximity Bass Strait, only 13 these yielded usable functions, whereas seven produced functions for subsequent an...

Introduction: The two most striking surface features on Mars are the crustal dichotomy and the Tharsis Rise [1]. While it is generally accepted that the Tharsis Rise is formed as a result of plume related volcanism [2], the formation mechanism for the crustal dichotomy is controversial with two main competing proposals: endogenic (mantle convection and flow) [3-5] and exo-genic (mega-impact) me...