TIARES Project—Tomographic investigation by seafloor array experiment for the Society hotspot

Suetsugu, Daisuke; Shiobara, Hajime; Sugioka, Hiroko; Ito, Aki; Isse, Takehi; Kasaya, Takafumi; Tada, Norio; Baba, Kiyoshi; Abe, Natsue; Hamano, Yozo; Tarits, Pascal; Barriot, Jean‐Pierre; Reymond, D.

doi:10.5047/eps.2011.11.002

Cited by 36 publications

(39 citation statements)

References 14 publications

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“…Following the definition of the Cascadia initiative (Sumy et al, 2015), the data recovery was 15 941 data days out of 19 751 deployment days or 80 % for the seismometers, and 18 735 data days or 94 % for the hydrophones (Table 1). Table 3.…”

Section: Network Performancementioning

confidence: 99%

“…Japanese large-scale imaging efforts around an oceanic hotspot were the PLUME Tahiti experiment with 9 Japanese broadband OBS (BBOBS) (Barruol, 2002;Suetsugu et al, 2005) and the TIARES array with again 9 BBOBS around the Society hotspot (Suetsugu et al, 2012). In 2011 German DEPAS OBS were deployed around the Tristan da Cunha hotspot (ISOLDE experiment, Geissler and Schmidt, 2013).…”

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confidence: 99%

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Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

et al. 2016

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Abstract. RHUM-RUM is a German-French seismological experiment based on the sea floor surrounding the island of La Réunion, western Indian Ocean (Barruol and Sigloch, 2013). Its primary objective is to clarify the presence or absence of a mantle plume beneath the Reunion volcanic hotspot. RHUM-RUM's central component is a 13-month deployment (October 2012 to November 2013) of 57 broadband ocean bottom seismometers (OBS) and hydrophones over an area of 2000 × 2000 km 2 surrounding the hotspot. The array contained 48 wideband OBS from the German DE-PAS pool and 9 broadband OBS from the French INSU pool. It is the largest deployment of DEPAS and INSU OBS so far, and the first joint experiment.This article reviews network performance and data quality: of the 57 stations, 46 and 53 yielded good seismometer and hydrophone recordings, respectively. The 19 751 total deployment days yielded 18 735 days of hydrophone recordings and 15 941 days of seismometer recordings, which are 94 and 80 % of the theoretically possible yields.The INSU seismic sensors stand away from their OBS frames, whereas the DEPAS sensors are integrated into their frames. At long periods (> 10 s), the DEPAS seismometers are affected by significantly stronger noise than the INSU seismometers. On the horizontal components, this can be explained by tilting of the frame and buoy assemblage, e.g. through the action of ocean-bottom currents, but in addition the DEPAS intruments are affected by significant selfnoise at long periods, including on the vertical channels. By comparison, the INSU instruments are much quieter at periods > 30 s and hence better suited for long-period signals studies.The trade-off of the instrument design is that the integrated DEPAS setup is easier to deploy and recover, especially when large numbers of stations are involved. Additionally, the wideband sensor has only half the power consumption of the broadband INSU seismometers.

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Section: Network Performancementioning

confidence: 99%

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confidence: 99%

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

et al. 2016

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“…The Tomographic Investigation by seafloor ARray Experiment for the Society hotspot (TIARES) project, conducted from 2009 to 2010, focused on the Society hotspot to investigate the details of the narrow plumes beneath the hotspot from the lower mantle to the surface. The TIARES network consisted of nine BBOBSs paired with ocean-bottom electromagnetometers (OBEMs) (Suetsugu et al 2012). In the present study, we resolve three-dimensional shear wave velocity structure of the upper mantle beneath the Society hotspot region and surroundings with a higher resolution than that of previous studies, using surface wave tomography that incorporates the TIARES data.…”

Section: Introductionmentioning

confidence: 72%

“…(Suetsugu et al 2012), 11 island stations from 2001 to 2005 by PLUME project (Barruol et al 2002), four island stations from 2005 to 2006 by GEOFON, and five island stations by SPANET (Ishida et al 1999). The permanent stations include two stations operated by Geoscope, three operated by Commissariat à l'Energie Atomique (CEA), ten by GSN, and two by Geoscience Australia.…”

Section: Datamentioning

confidence: 99%

Upper mantle structure beneath the Society hotspot and surrounding region using broadband data from ocean floor and islands

et al. 2016

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We determined the three-dimensional shear wave velocity structure beneath the South Pacific superswell down to a depth of 200 km by analyzing fundamental Rayleigh wave records from permanent and temporary land-based and seafloor seismometers in the Pacific Ocean. Data from the Tomographic Investigation by seafloor ARray Experiment for the Society hotspot (TIARES) project yield excellent spatial resolution of velocity anomalies in the central part of the superswell, near the Society hotspot. Localized slow anomalies are found near hotspots in the upper mantle, but the vertical profiles of the anomalies vary from location to location: Slow anomalies near the Samoa, Macdonald, Pitcairn, and Society hotspots extend to at least 200 km depth, while a slow anomaly near the Marquesas hotspot extends only to ~150 km depth. Owing to the recently deployed seafloor array, horizontal resolutions of slow anomalies near the Society hotspot are substantially improved: The slow anomalies are about 300 km in lateral extent and have velocity anomalies as low as −6 %. The lithosphere thickness is estimated to be ~70 km in the vicinity of all hotspots, which may indicate thermal erosion by mantle plumes.

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“…We used the P-velocity model obtained by Obayashi et al (2016) using data from the Tomographic Investigation by seafloor Array Experiment for the Society hot spot (TIARES) BBOBS network (Suetsugu et al 2012) as the part of global data set including the arrival time data from the International Seismological Centre. The travel times of the TIARES BBOBS network were estimated for all the same events used for the tomography, and root mean The synthetic experiment indicated that shallowlayer reverberation could influence the cross-correlation measurements of the relative travel time among a BBOBS array at periods longer than 10 s. We proposed a simple method to correct differential P-wave travel times between two sites for shallow-layer reverberation by cross-convolution of the shallow-layer responses at the two sites.…”

Section: Discussionmentioning

confidence: 99%

Effects of shallow-layer reverberation on measurement of teleseismic P-wave travel times for ocean bottom seismograph data

Obayashi

Ishihara

Suetsugu

2017

Earth Planets Space

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We conducted synthetic experiments to evaluate the effects of shallow-layer reverberation in oceanic regions on P-wave travel times measured by waveform cross-correlation. Time shift due to waveform distortion by the reverberation was estimated as a function of period. Reverberations in the crystalline crust advance the P-waves by a frequency-independent time shift of about 0.3 s in oceans. Sediment does not affect the time shifts in the mid-ocean regions, but effects as large as −0.8 s or more occur where sediment thickness is greater than 600 m for periods longer than 15 s. The water layer causes time delays (+0.3 s) in the relatively shallow (<3500 m) water region for periods longer than 20 s. The time shift may influence mantle images obtained if the reverberation effects are not accounted for in seismic tomography. We propose a simple method to correct relative P-wave travel times at two sites for shallow-layer reverberation by the cross-convolution of the crustal responses at the two sites.

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TIARES Project—Tomographic investigation by seafloor array experiment for the Society hotspot

Cited by 36 publications

References 14 publications

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

Performance report of the RHUM-RUM ocean bottom seismometer network around La Réunion, western Indian Ocean

Upper mantle structure beneath the Society hotspot and surrounding region using broadband data from ocean floor and islands

Effects of shallow-layer reverberation on measurement of teleseismic P-wave travel times for ocean bottom seismograph data

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