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The objective of this research is to determine the level of tectonic activity based on morphometric and morphotectonic analysis in the selected case study area is located around the Lamongan Volcano Complex which covers the watershed sub-basin of the Lecari, Bondoyudo, Dilem, Jatiroto, Rondoningu, and Banyubiru Rivers. Administratively, the area is within the region of Lumajang, Jember, and Probolinggo Regencies, East Java Province, Indonesia. For this purpose, a set of parameters namely, drainage pattern, morphometry, morphotectonics, and geological structure were considered as an effective platform to clarify the existence of tectonic activity. The analyzed morphometric variables consisted of the dimensions of the sub-watershed area, stream segment azimuth, landform azimuth, stream length, drainage density (Dd), bifurcation ratio (Rb), and mountain-front sinuosity (Smf). As for the data analysis, this research used a quantitative descriptive approach. The results show that the Dd value ranged from 3.4 to 4.7 with Rb ranging from 1.0 to 9.2, and the Smf value ranges from 1.2 to 3.4, hence based on those values indicated that the study area has an ascendancy of tectonic activity. Since the Lamongan Volcano Complex is a volcanism-prone area, therefore, tectonic deformation monitoring is needed to reduce the impact of disasters, as the effects are more complicated when the volcano is located in a densely populated area.

IDENTIFICATION OF TECTONIC DEFORMATION USING MORPHOMETRICAL ANALYSIS OF LAMONGAN VOLCANO COMPLEX