德国南部地区Love波相速度分布

在利用远震面波资料研究小区域内的地壳上地幔速度结构时，传统的面波层析成象所依据的大圆路径和平面波入射假设不能成立．本文利用德国区域地震台网记录的Love波资料，根据Friederich和Wielandt提出的面波波场和速度结构联合反演方法，对德国南部地区的Love波相速度横向不均匀分布作了初步研究．反演得到各个周期面波相速度分布的主要特征是稳定的，不随资料选取而改变．30s左右Love波相速度主要受地壳厚度控制，反演得到的相速度分布与该区域已知的莫霍面深度分布有很好的对应关系．39-66s周期的Love波相速度图像随周期逐渐改变，过渡到一个主要受岩石圈下部上地幔构造活动控制的格局．在75-113s周期范围内的相速度分布图像表明，莱茵地堑等构造活动区为明显的低速区．在研究区域东北部的构造稳定地区，从20-113s周期始终显示为高速区．

LOVE WAVE PHASE VELOCITY MAP IN SOUTHERN GERMANY

In the study of crustal and upper mantle velocity structure with teleseismic surface wave data, the great circle path and plane wave assumptions of conventional surface wave tomography are no longer valid. By means of the joint inversion method for wave field and velocity structUre developed by Friederich and Wielandt we made a preliminary study on the laterally inhomogeneous distribution of Love wave phase velocities in southern Germany, using Love wave data recorded by the German Regional Seismograph Network. The main features of the resulted phase velocity map at various Periods are stable, do not change with the selection of data. The phase velocity of 30 seconds Love wave is mainly affected by the crustal thickness, the phase velocity map correlates well with the known Moho depth distribution. From 39 to 66 seconds the velocity maps change gradually with periods to a pattern controled by tectonic activities in the lower part of lithosphere. T'he phase velocity maps betWeen 75 and 113 seconds indicate clear low velocity zones in Rhine graben and other tectonically active areas. In the tectonically stable area in the northeastern part of study region high velocity PersistS from 20 to 113 seconds Period.