The Santorini-Amorgos zone is an area rich in microseismicity at the center of the Hellenic volcanic arc. The microseismicity of the zone is distributed along the Santorini-Amorgos ridge and Kolumbo submarine volcano. In this study, we utilized crustal events that were recorded by temporary networks during September 2002 to July 2004 and October 2005 to March 2007, and also by the permanent network from 2011 to 2020. These events were inverted for their moment tensors by using P-wave polarities as well as SV/P and SH/P amplitude ratios, yielding 74 well-constrained moment tensor solutions. Most of these moment tensors have significant CLVD and isotropic components that are positively correlated to each other (R² = 0.68). Tensile faulting due to high pore pressure is considered as the most likely cause of the observed non-DC components. The positive and negative non-DC components observed in Kolumbo may be generated by the opening and closing of cracks beneath the shallow (6–7 km) magma chamber due to a steady migration of magmatic fluids from the deep reservoir into the chamber. In Anydros, most of the microearthquakes have positive non-DC components associated with the opening of cracks. It is possible that the extensional deformation and high pore fluid pressure in the area opens subvertical cracks that become pathways for upward migrating fluids. The upward migration of magmatic fluids in an extensional regime such as the Santorini-Amorgos zone can also be viewed as an indication of emerging volcanic activity in this area.

圣托里尼-阿莫尔戈斯区是希腊火山弧中心的一个富含微震的地区。该区的微地震活动沿圣托里尼-阿莫尔戈斯海脊和科伦博海底火山分布。在这项研究中，我们利用临时网络在 2002 年 9 月至 2004 年 7 月和 2005 年 10 月至 2007 年 3 月期间以及永久网络在 2011 年至 2020 年期间记录的地壳事件。这些事件通过使用 P-波极性以及 SV/P 和 SH/P 幅度比，产生 74 个约束良好的矩张量解。大多数这些矩张量具有显着的 CLVD 和各向同性分量，它们彼此正相关（R ² = 0.68）。由于高孔隙压力引起的拉伸故障被认为是观察到的非直流分量的最可能原因。在 Kolumbo 观察到的正负非 DC 分量可能是由于岩浆流体从深部储层稳定迁移到岩浆房而导致浅层（6-7 公里）岩浆房下方裂缝的打开和关闭产生的。在 Anydros 中，大多数微地震具有与裂缝张开相关的正非直流分量。该地区的拉伸变形和高孔隙流体压力可能会打开近垂直裂缝，成为向上运移流体的通道。岩浆流体在诸如圣托里尼-阿莫尔戈斯带等伸展状态中的向上迁移也可以被视为该地区新兴火山活动的迹象。