Seismic interferometry with antipodal station pairs

Lin, F. C.; Tsai, Victor C.

doi:10.1002/grl.50907

Cited by 52 publications

(47 citation statements)

References 21 publications

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“…In this study we apply earthquake coda interferometry techniques [ Lin et al ., ; Lin and Tsai , ; Wang et al ., ] to 1846 USArray stations deployed across North America from January 2004 through September 2013 (Figure b) to extract differential travel times of PKIKP 2 and PKIIKP 2 . Its dense station spacing, high quality recordings (e.g., uniform instrumentation), and especially its wide aperture make USArray an ideal network to probe the deep Earth with seismic interferometry.…”

Section: Introductionmentioning

confidence: 99%

High‐resolution probing of inner core structure with seismic interferometry

Huang

Lin

Tsai

et al. 2015

Geophysical Research Letters

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Increasing complexity of Earth's inner core has been revealed in recent decades as the global distribution of seismic stations has improved. The uneven distribution of earthquakes, however, still causes a biased geographical sampling of the inner core. Recent developments in seismic interferometry, which allow for the retrieval of core‐sensitive body waves propagating between two receivers, can significantly improve ray path coverage of the inner core. In this study, we apply such earthquake coda interferometry to 1846 USArray stations deployed across the U.S. from 2004 through 2013. Clear inner core phases PKIKP2 and PKIIKP2 are observed across the entire array. Spatial analysis of the differential travel time residuals between the two phases reveals significant short‐wavelength variation and implies the existence of strong structural variability in the deep Earth. A linear N‐S trending anomaly across the middle of the U.S. may reflect an asymmetric quasi‐hemispherical structure deep within the inner core with boundaries of 99°W and 88°E.

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Section: Introductionmentioning

confidence: 99%

High‐resolution probing of inner core structure with seismic interferometry

Huang

Lin

Tsai

et al. 2015

Geophysical Research Letters

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“…Ruigrok et al () used distant earthquake reverberations to conduct imaging across a 2‐D array in the United States. Lin and Tsai () used antipodal station pairs to extract global body wave phases by cross‐correlating noise and earthquake coda. Boué et al () retrieved deep seismic phases by correlating continuous broadband records containing seismic ambient noise and coda waves exploiting reverberation and scattering.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of Interstation Local Body Waves From Teleseismic Coda Correlations

Saygin

2019

JGR Solid Earth

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We retrieve the local P wave empirical Green's functions between the elements of five different regional arrays across the globe by cross‐correlating and bin stacking the teleseismic earthquake coda waves recorded at each array. The stack is made using the coda of P and S wave phases for events in the distance range from 40° to 50° from the center of the array. With a sequence of time windows along the coda the various body wave arrivals can be tracked, using record sections constructed by binning the stacked interstation correlograms in less than 1‐km distance increments. The correlation of the coda part of each principal seismic phase produces highly coherent interstation arrivals for different analysis windows. Such arrivals can be reproduced by just stacking 100 arrivals from a pool of more than a thousand events, showing the stability of the observed Green's functions. Modeling for the structure beneath the Warramunga array in the Northern Territory, Australia, demonstrates that these arrivals correspond to multiply reflected arrivals from layers at different depths. The recovery of high‐frequency interstation body waves from the teleseismic earthquake coda opens the prospect of conducting local high‐resolution seismic imaging with teleseismic energy.

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“…In these studies networks with dozens of stations were used for stacking to obtain signals of sufficient quality. Lin and Tsai [] showed that the recovery of teleseismic body waves traveling between antipodal stations is effective for sequences of seismic records that contain large earthquakes. This allowed for the retrieval of body waves traversing the Earth between individual stations, which suggests that the nature of the wavefield excited by large earthquakes is better suited for the retrieval of teleseismic body waves than ambient seismic noise.…”

Section: Introductionmentioning

confidence: 99%

The lack of equipartitioning in global body wave coda

Sens‐Schönfelder

Snieder

Stähler

2015

Geophysical Research Letters

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Correlation of the coda of large earthquakes can be used to retrieve body waves at teleseismic distances. This retrieval depends on waves propagating with equal energy in all directions (equipartitioning). We carry out a beamforming analysis of body waves at periods of 10 and 40 s recorded at USArray and show that the late coda, up to 10 h after the Okhotsk earthquake, is dominated by waves propagating in the great circle direction; late coda waves are not equipartitioned. This implies for seismic interferometry that teleseismic body waves can only be extracted from the coda when the earthquake and the receivers are located on a great circle. This happens automatically when the employed stations are antipodal or when the autocorrelation of waves is used. The use of long-period ambient seismic noise relies on the distribution of sources because scattering only marginally randomizes directions. This provides insight into recent observations of core phases extracted from seismic interferometry.

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Seismic interferometry with antipodal station pairs

Cited by 52 publications

References 21 publications

High‐resolution probing of inner core structure with seismic interferometry

High‐resolution probing of inner core structure with seismic interferometry

Retrieval of Interstation Local Body Waves From Teleseismic Coda Correlations

The lack of equipartitioning in global body wave coda

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