It was not easy to get hold of a planetary geologist on such short notice, just before Foundation day. During this major holiday most places are closed and folks go home to celebrate with family and watch fireworks in the park. But talking to a capsuleer -the rarest of breed- is always enticing and opens doors.
My next expert is dr. Torayedeh Vavari of the Gammel Geophysical Society. She is a young postdoctoral researcher in planetary sciences, specializing in the seismology of rocky planets. We met at the library of the society, she brought her child (she recently became a mother). Like many young researchers, she is quite ambitious and full of projects and ideas.
The lava fields and large cracks in the planetary crust are recent. That can be seen from the cooling rate, as well as from motion of the surface as it settles back down after a shock. The original hypothesis is that the planet suffered a catastrophic meteor impact not too long ago. The small square in the image below shows the estimated point of impact. Close-by ridges circle it, and geologists identify at least four "rings of fire" of wide lava canyons and cracks partly circling it at larger distances, thousands of kilometers.

