Academic Journal
Crustal Shear‐Wave Velocity and Azimuthal Anisotropy Imaging Reveals the Merapi‐Merbabu‐Telomoyo Volcanic Chain, Central Java.
| Title: | Crustal Shear‐Wave Velocity and Azimuthal Anisotropy Imaging Reveals the Merapi‐Merbabu‐Telomoyo Volcanic Chain, Central Java. |
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| Authors: | Ramadhan, Iqwal, Widiyantoro, Sri, Zulfakriza, Metaxian, Jean‐Philippe, Rawlinson, Nicholas, Montagner, Jean‐Paul, Yudistira, Tedi |
| Source: | Geophysical Research Letters; 9/28/2026, Vol. 53 Issue 18, p1-10, 10p |
| Abstract: | We present new results from ambient noise tomography and azimuthal anisotropy analysis of the DOMERAPI data set to investigate crustal structure beneath the Merapi‐Merbabu‐Telomoyo region in central Java. The 3D shear‐wave velocity (Vs) model reveals a prominent high‐Vs anomaly extending from south of Merapi through Merbabu to Telomoyo, aligned with the Merapi‐Merbabu Fault. A low‐Vs anomaly to ∼8 km depth southwest of Merapi indicates a fluid‐rich or magmatically influenced upper crust. Azimuthal anisotropy exhibits dominant NNW‐SSE fast axis oreintations parallel to the volcanic chain but distinct from the direction of plate motion. Strong anisotropy beneath Merapi, contrasting with weaker anisotropy beneath high‐Vs Merbabu, highlights the role of local deformation and magmatism. Our results suggest upper‐crustal anisotropy is primarily governed by internally generated stresses within the overriding Sunda Plate, rather than by regional plate motion. Plain Language Summary: We use seismic noise (mainly generated by ocean wave activity) recorded around the Merapi‐Merbabu‐Telomoyo region to image the Earth's crust. The results reveal a strong, high‐velocity zone linking the three volcanoes, likely representing a rigid crustal structure. In contrast, a low‐velocity zone southwest of Merapi suggests the presence of fluids or magma. We also find that subsurface structures are aligned with volcanic chain rather than large‐scale plate motion. This indicates local processes, such as magma movement and deformation, play a key role in shaping shallow crust. Key Points: 3D shear‐wave velocity model from ambient noise tomography reveals a volcanic alignment across Merapi, Merbabu, and TelomoyoShallow magma reservoir identified beneath Merapi volcano to the southwest of the summitAzimuthal anisotropy shows fast axes trending NNW‐SSE, parallel to the Merapi‐Merbabu‐Telomoyo volcanic chain [ABSTRACT FROM AUTHOR] |
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| Database: | Complementary Index |
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