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4D seismic travel time tomography for detecting temporal velocity changes
Author(s) -
Zhang Haijiang,
Chen Yukuan,
Qian Jiawei,
Zhang Xin
Publication year - 2019
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.14093
Subject(s) - space science , chinese academy of sciences , zhàng , china , library science , space (punctuation) , engineering physics , engineering , geography , computer science , archaeology , aerospace engineering , operating system
It has been a challenge to image temporal velocity changes by seismic travel time tomography. Standard time-lapse velocity tomograms are generally obtained by subtracting velocity models resulting from separate seismic tomography for different time periods. However, this could introduce some artifacts in temporal velocity changes because of different data distribution and data quality at different time periods. If more seismic events are included in the tomographic system, the inverted velocity models do not have the necessary time resolution to resolve velocity changes. But if fewer events are used for separate time periods, the system is less stable, and the inverted model may contain some artifacts and thus resolved velocity changes may not be real. To mitigate against these issues, we developed three different schemes to conduct 4D (or time-dependent) seismic travel time tomography.