Right: The fissure in question, with dark material spread out around it, possibly from very recent pyroclastic flows.
There are lobes or wings of dark material extending for many kilometers on either side of the fissure along about half its length.
Sand dunes ripple across the floor of a graben in Cerberus Fossae on Mars in this enhanced color image (Mars is dark grey and ochre, not blue).The total amount of dark material there is about 20 million cubic meters, or a cube roughly 270 meters on a side, but it's spread out over a lot of area, and is probably up to a few dozen centimeters thick near the fissure (this was determined by looking at craters from impacts that happened after the material was deposited; they reveal how deep the material is).Cerberus Fossae is a set of largely parallel cracks in the surface of Mars near the Equator.NASA has a lander called InSight on the other side of Elysium Planitia, about 1700 km to the southwest of this area.
InSight has a seismograph, and it has detected quite a few marsquakes, including two fairly big ones (about magnitude 3) in Mach 2021 coming from the direction of Cerberus Fossae.
Cerberus Fossae might be a good place to eventually look