Bentuk geologi dari kawah Galunggung, secara keseluruhan paling baik dapat dipelajari berdasarkan potret 14 dan 15. Disini jeles tampak, bahwa aliran lava dan lapisan abu yang membangun pema tang kawahnya yang tinggi, menurun dari kawah Guntur. Dilihat dari adanya tangga tempat jatuhnya air terjun dari kawah ini ke bawah, lereng ini pada potret 15 juga sangat jelas.
Dalam Vulk. Ber. n. XVIII diberitakan, bahwa G. Slamat dikunjungi akhir 1922, tetapi tidak diamati perubahan dalam kegiatannya. Kegiatan fumarolanya ternyata sama seperti digambarkan oleh Jung-huhn dalam pertengahan abad yl.
As mentioned, during the observation, extensive temperature observations were carried out. From this on the first place appeared, that within the crater groups of solfatara's and hot springs can be distinguished, which temperature strongly varied. The distribution of the temperatures is for a fixed day (September 2, 1924) given on Plate II. We see from this, that the highest temperature occurre…
Phenomena which would indicate on an increased activity on the Kelut were not observed during 1924 and in the beginning of 1925. A fow light earthshocks, which were felt in the lowercamp, appeared to be of tectonic origin.