Abstract:
For the Beijing Continuous GNSS stations, the site distances are small and
most of the stations are soil-based. The construction of the stations do not fully comply
with the earthquake monitoring standards and the crustal movement is in a very low
level. Considering all the above factors, we need study the feasibility to use the Beijing
Continuous GNSS stations for monitoring the crustal movement in Beijing. In this
paper, we carried out some preliminary study on respects of error, disturbance, point,
line and area based on a decade observational data. The results show that, the error can
be controlled by reasonable data processing methods and abandoning observations
with large error. By identifying and excluding some interference, we carried out
the site displacement analysis and found out the development process before and
after the Tokyo 8.0 earthquake. By analyzing the changing of the baselines between GNSS stations we acquired the movement characteristics of two active fault. By
analyzing the area changing, we realized some relationship among the area changing,
comprehensive Precursory information and mean moving rate of the faults. According
to the preliminary results, we think the Continuous GNSS stations can be used for
earthquake monitoring in Beijing.
由于北京市 GNSS 连续观测台网孔径较小、土层站较多、站点建设不
完全符合地震监测规范、地壳运动水平较低等原因,能否用 GNSS 监测北京地
区的地壳运动,需要作可行性研究。本文利用十多年实际观测资料,在误差、干扰、
点、线、面等几个方面进行了初步研究。结果表明:误差可由解算方法和大误
差测值的舍弃得到一定程度控制,通过识别并排除部分干扰,对测站的位移进行分析得到了日本 9 级大地震有关的远场地壳形变变化过程,通过基线变化分
析得到了测区内两条活断层运动特点,通过面积元素分析得到了面积变化与前
兆综合信息量、断层活动年变率存在可比性。初步认为,在采取较为严格措施后,
GNSS 观测能用于北京地区的地震监测。