| Autor: |
Madeleine M. Festin, Michael S. Thorne, Mingming Li |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
The Seismic Record, Vol 4, Iss 2, Pp 111-120 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2694-4006 |
| DOI: |
10.1785/0320240003 |
| Popis: |
We investigate broadband SPdKS waveforms from earthquakes occurring beneath Myanmar. These paths sample the core–mantle boundary beneath northwestern China. Waveform modeling shows that two ∼250 × 250 km wide ultra-low velocity zones (ULVZs) with a thickness of roughly 10 km exist in the region. The ULVZ models fitting these data have large S-wave velocity drops of 55% but relatively small 14% P-wave velocity reductions. This is almost a 4:1 S- to P-wave velocity ratio and is suggestive of a partial melt origin. These ULVZs exist in a region of the Circum-Pacific with a long history of subduction and far from large low-velocity province (LLVP) boundaries where ULVZs are more commonly observed. It is possible that these ULVZs are generated by partial melting of mid-ocean ridge basalt. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
