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Study of mountain uplifting mechanism of Peruvian Andes

秘鲁安第斯山脉抬升机制研究

基本信息

批准号：
09041097
负责人：
FUKAO Yoshio
金额：
$ 8.58万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09041097/
关键词：
Andes gravity Peru Bouguer correstion gravimeter 火山岩層地質 IGP 枕状溶岩堆積層断層

项目摘要

We collected all the data of gravity measurements carried out over the last 40 years by Instituto Geofisico del Peru (IGP). Because of long time since the data collection, some of the important information needed for data reduction were lost in the mean time. For instance, it is not quite certain which constant table among several were applied to a particular to a particular survey conducted with a certain gravimeter. There were also other difficulties caused by the nature of the IGP dataset which became apparent to us in the course of conversion of the original data to gravity values. An example of this kind is that the measurement usually started at some point on the survey route and ended at another, so that it is difficult to find gravity stations correlatable to known references. Because of these problems, it was impossible to determine the gravity values unambiguously from the IGP data alone. Accordingly, there was a need for independently determined gravity stations to which the measurements done by IGP may be compared. In order to provide reference gravity values, we recalibrated the Japanese survey data obtained in 1980 and 1984, and conducted more surveys in various parts of Peru during the period from 1995 to 1998. These gravity stations number more than 800, and provide three or more reference points for each of the IGP survey routes. Using these references, the gravity values were calculated for the IGP dataset and Bouguer corrections were applied. Finally we established more than 10,000 gravity values in all survey routes and a Bouguer anomaly map of whole Peru was successfully produced based on these data.

我们收集了秘鲁地球物理研究所（IGP）在过去40年中进行的所有重力测量数据。由于数据采集时间较长，数据整理所需的一些重要信息在采集过程中丢失。例如，对于用某台重力仪进行的某次测量，在几个常数表中，哪一个常数表是适用的，就不十分确定了。在将原始数据转换为重力值的过程中，我们发现，由于IGP数据集的性质，还存在其他困难。这种类型的一个例子是，测量通常从测量路线上的某个点开始，在另一个点结束，因此很难找到与已知参考相一致的重力站。由于这些问题，不可能仅从IGP数据明确地确定重力值。因此，需要独立确定的重力站，可以将IGP进行的测量与之进行比较。为了提供参考重力值，我们重新校准了1980年和1984年获得的日本调查数据，并在1995年至1998年期间在秘鲁各地进行了更多的调查。这些重力站的数量超过800个，并为每个IGP测量路线提供三个或更多的参考点。使用这些参考资料，计算了IGP数据集的重力值，并应用了布格校正。最后，我们在所有测量路线上建立了10，000多个重力值，并根据这些数据成功地制作了整个秘鲁的布格异常图。