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模拟退火法系一种非线性整体搜索算法,本文用以反演远震P波波速慢度和方位数据,求解地壳速度结构。综合试验表明,用模拟退火法能够以合理的精度确定P波低速带的空间位置,并能使近70％的目标速度扰动得以再现。实验表明,用少至两个台站的资料便可得到明显的结果。对长谷火山口的射线方向数据的反演发现,在8km深的再生穹丘构造以下存在一个不对称的低速带,相对背景波速有-25％的变动。这一低速带向东南延伸,深度至少达24km,其波速变动约为-10％。这些特征基本与远震走对的反演结果以及射线方向的正演模拟结果相一致,可能与长谷破火山口残余的岩浆房有关。
The simulated annealing method is a nonlinear global search algorithm, which is used to invert the slowness and azimuth data of teleseismic P-wave velocity to solve the crustal velocity structure. The comprehensive tests show that the simulated annealing method can determine the spatial location of the low-speed P-band with reasonable accuracy and can reproduce nearly 70% of the target speed disturbances. Experiments show that using as few as two stations of the data can be obvious results. Inversion of the data of the direction of the long valley crater revealed that there is an asymmetric low velocity zone below the reclaimed dome structure with an altitude of 8 km with a -25% relative background velocity variation. This low velocity zone extends southeast to a depth of at least 24km with a velocity variation of about -10%. These characteristics are basically consistent with the inversion results of the long-distance strike and the forward modeling results of the ray direction, which may be related to the residual magma chamber in the Canggu caldera.