SOIL VULNERABILITY ASSESSMENT USING THE HORIZONTAL AND VERTICAL SPECTRUM RATIO (HVSR) METHOD OF AMBIENT NOISE WAVES, EAST JAVA ,INDOSEIA. (2022). Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics, 5(1), 63-71. https://doi.org/10.15408/fiziya.v5i2.17226