Birt lunar domes
Taken by Raffaello Lena on January 26, 2026 @
Rome Italy
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Details:
The lunar domes in Birt are two domes bisected by two rilles . These two domes, named as Birt 1 and 2, are located in Mare Nubium, near the elongated crater Birt E. It is likely the vent of Birt 1. Rupes Recta is also imaged in this image. It is a linear fault on the Moon,which casts in this phase a wide shadow that gives it the appearance of a steep cliff. The dome diameters of Birt 1 and Birt 2 amount to 16.0 and 7.8km, respectively. Based on the elevation map on the DTM of Birt 1 and Birt 2 I have found that height of the dome Birt 1 is determined to 160 ± 20m, resulting in an average slope of 1.22° ± 0.10°. The height of the dome Birt 2 amounts to 70 ± 10m, yielding a slope of 1.03° ± 0.15°. The dome volumes are determined to 17.3km³ and 1.3km³ for Birt 1 and Birt 2, respectively. The plausible interpretation is that lava melt tracked up a fault in this region, bowed up the surface, and fractured it, resulting in at least two rilles. Parts of the intruded magma reached the surface, thus forming the domes at the northern end of Rima Birt, Birt 1 and 2. Possibly two rille segments formed as a surface expression of two separate dikes. In a subsequent phase, an explosive activity occurred, originating the pyroclastic deposit. Enclosed edited images for contrast
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