Yi Yang's research while affiliated with Peking University and other places
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Publications (8)
Differential rotation of Earth’s inner core relative to the mantle is thought to occur under the effects of the geodynamo on core dynamics and gravitational core–mantle coupling. This rotation has been inferred from temporal changes between repeated seismic waves that should traverse the same path through the inner core. Here we analyse repeated se...
The Earth's solid inner core (IC) is generally believed to rotate relative to the mantle, but the proposal remains controversial. Here we use seven waveform doublets in the South Sandwich Islands region with time lapses of 5.8–17.0 years that are recorded by two close stations in Kyrgyzstan with virtually the same epicentral distance. The fortuitou...
Clock accuracy is a basic parameter of any seismic station and has become increasingly important for seismology as the community seeks to refine structures and dynamic processes of the Earth. In this study, we measure the arrival time differences of mod- erate repeating earthquakes with magnitude 5.0–5.9 in the time range of 1991–2017 at the same s...
Plain Language Summary
Monitoring of the temporal variations of the sub‐surface medium has been a long‐sought goal for understanding earthquake genesis. A recent technology (so‐called ambient noise interferometry) that uses ubiquitous ambient noise of the Earth allows the extraction of seismic surface waves between two observing receivers, which ma...
In this reply, we address the main issues raised by Yao et al. (2020) and conduct additional analyses, particularly on the seismic station clock problems and the influence of earthquake depth. We show that although the depth is an important issue to consider, the depth difference of our doublets is too small to be significant. Extensive analyses re...
Temporal changes of inner-core (IC) seismic phases have been confirmed with high-quality waveform doublets. However, the nature of the temporal changes is still controversial. We investigated systematically the temporal changes of IC refracted (PKIKP) and reflected (PKiKP) waves with a large data set of waveform doublets. We used non-IC reference p...
Time‐dependent travel times of seismic waves traversing the inner core from repeating earthquakes provided compelling evidence for an inner core differential motion. Here we conducted a systematic search for strong repeating earthquakes in the last three decades to examine the global pattern of temporal changes of the inner core. We performed exten...
Citations
... WT, a time-frequency analysis method, allows changes in both time and frequency windows. We used Morlet basis functions [26] and Fourier transform to analyze the periodic components of the time series; subsequently, we used Daubechies (db) basis functions [27,28] to extract the periodic terms, which were used for seasonal intensity analysis of different data at each station. The periodic term extracted by the seventh order db8 basis function corresponded to a daily sampling rate of 0.35-0.70 ...
... It seems a persistent problem in II.AAK during the period between mid-2004 and mid-2007, from the origin times of the related repeating earthquakes (Table S2). The observation is also consistent with the comparison between the teleseismic arrival times recorded by the nearly collocated stations II.AAK and KN.AAK (Yang and Song, 2021). However, we did not find the error of 1.02 s in the station II.DGAR (Diego Garcia, Chagos Islands) recently reported by Table S1). ...
... We examined the waveform doublets in the South Sandwich Islands (SSI) region (Table S1 in Supporting Information S1) from a recent doublet search (Yang & Song, 2020a) and found 10 pairs with identifiable IC phases well above the background noise level at the stations used in this study (See Text S1 and Table S1 in Supporting Information S1 on data source and processing). We focused on seven main pairs with time lapses (dT) of greater than 5 years (from 5.8 to 17.0 years) that also show obvious IC temporal changes. ...
... We did make a few assumptions that the mantle influence in the ddt is small, that each local gradient is linear, and that the IC lateral shifts are from the rigid body rotation of the IC around the spin axis of the Earth, all of which seem reasonable. The new rate is also consistent with relatively low rates (0.05-0.10°/yr) in recent studies (Vidale, 2019;Yang & Song, 2020b) and remarkably close to the most recent estimate of 0.125°/yr from IC scattering waves by Wang and Vidale (2022). Such a slow rotation can also reconcile with a marginal rate of 0.13 ± 0.11°/yr from the normal-mode data (Laske & Masters, 2003). ...
