Real-time inversions for finite fault slip models and rupture geometry based on high-rate GPS data

On 2020 October 30, an Mw6.9 earthquake struck offshore&#160;Samos Island. Severe structural damages were observed in Greek Islands and city of Izmir (Turkey). 114 people lost their lives and more than a thousand people were injured in Turkey. The earthquake triggered local tsunami. Significant seismic activity occurred in this region following the earthquake and ~1800 aftershocks (M>1) were recorded by KOERI within the first three days. In this study, we analyze the slip distribution and aftershocks of the 2020 earthquake.For the aftershock relocations, the continuous waveforms were collected from NOA, Disaster and Emergency Management Authority of Turkey (AFAD) and KOERI networks. The database &#160;&#160;was created based on merged catalogs from AFAD and KOERI. For estimating optimized aftershock location distribution, the P and S phases of the aftershocks are picked manually and relocated with double difference algorithm. In addition, source mechanisms of aftershocks M>4 are obtained from regional body and surface waveforms.The surface deformation of the earthquake was obtained from both descending and ascending orbits of the Sentinel-1 A/B and ALOS2 satellites. Since the rupture zone is beneath the Gulf of Kusadas&#305;, earthquake related deformation in the interferograms can only be observed on the northern part of the Samos Island. We processed all possible pairs chose the image pairs with the lowest noise level.In this study, we used 25 continuous GPS stations which are compiled from TUSAGA-Aktif in Turkey and NOANET in Greece. In addition to continuous GPS data, on 2020 November 1, GPS survey was initiated and the earthquake deformation was measured on 10 GNSS campaign sites (TUTGA), along onshore of Turkey.The aim of this study is to estimate the spatial and temporal rupture evolution of the earthquake from geodetic data jointly with near field displacement waveforms. To do so, we use the Bayesian Earthquake Analysis Tool (BEAT).As a first step of the study, rectangular source parameters were estimated by using GPS data. In order to estimate the slip distribution, we used both ascending and descending tracks of Sentinel-1 data, ALOS2 and GPS displacements. In our preliminary geodetic data based finite fault model, we used the results of focal mechanism and GPS data inversion solutions for the initial fault plane parameters. The slip distribution results indicate that earthquake rupture is ~35 km long and the maximum slip is ~2 m normal slip along a north dipping fault plane. This EW trending, ~45&#176; north dipping normal faulting system consistent with this tectonic regime in the region. This seismically active area is part of a N-S extensional regime and controlled primarily by normal fault systems.AcknowledgementsThis work is supported by the Turkish Directorate of Strategy and Budget under the TAM Project number&#160;2007K12-873.

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High rate GPS data on active volcanoes: an application to the 2005–2006 Mt. Augustine (Alaska, USA) eruption

Terra Nova ◽

10.1111/j.1365-3121.2008.00798.x ◽

2008 ◽

Vol 20 (2) ◽

pp. 134-140 ◽

Cited By ~ 15

Author(s):

Mario Mattia ◽

Mimmo Palano ◽

Marco Aloisi ◽

Valentina Bruno ◽

Yehuda Bock

Keyword(s):

High Rate ◽

Gps Data ◽

Active Volcanoes

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A Bridge Deflection Monitoring with GPS

Artificial Satellites ◽

10.2478/v10018-008-0010-3 ◽

2007 ◽

Vol 42 (4) ◽

pp. 229-238 ◽

Cited By ~ 5

Author(s):

M. Figurski ◽

M. Gałuszkiewicz ◽

M. Wrona

Keyword(s):

Interdisciplinary Approach ◽

High Rate ◽

Gps Data ◽

Bridge Management ◽

Technology Research ◽

Traffic Loading ◽

Gps Receivers ◽

The Road ◽

University Of Technology ◽

Compute Data

A Bridge Deflection Monitoring with GPSThis paper introduces results of investigation carried on by The Applied Geomatics Section in Military University of Technology. Research includes possibilities of monitoring dynamic behavior of a bridge using high rate GPS data. Whole event was executed with collaboration of The Road and Bridge Management and The Warsaw Geodesy Company. Interdisciplinary approach with this project allows authors to get reliable information about investigating constructions and their respond for true traffic loading detected by GPS receivers. Way of compute data and used software (TRACK) are also shown in this paper.

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Real-Time Coseismic Velocity and Displacements Retrieving and De-Noising Process by High-Rate GNSS

Lecture Notes in Electrical Engineering - China Satellite Navigation Conference (CSNC) 2013 Proceedings ◽

10.1007/978-3-642-37404-3_42 ◽

2013 ◽

pp. 523-537 ◽

Cited By ~ 1

Author(s):

Rui Tu ◽

Rongjiang Wang ◽

Yong Zhang ◽

Maorong Ge ◽

Qin Zhang

Keyword(s):

Real Time ◽

High Rate

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Development of an inversion method to extract information on fault geometry from teleseismic data

Geophysical Journal International ◽

10.1093/gji/ggz496 ◽

2019 ◽

Vol 220 (2) ◽

pp. 1055-1065 ◽

Cited By ~ 3

Author(s):

Kousuke Shimizu ◽

Yuji Yagi ◽

Ryo Okuwaki ◽

Yukitoshi Fukahata

Keyword(s):

Fault Plane ◽

Slip Rate ◽

Rate Function ◽

Fault Slip ◽

Body Waves ◽

Fault System ◽

Inversion Method ◽

Fault Geometry ◽

Finite Fault ◽

Extract Information

SUMMARY Teleseismic waveforms contain information on fault slip evolution during an earthquake, as well as on the fault geometry. A linear finite-fault inversion method is a tool for solving the slip-rate function distribution under an assumption of fault geometry as a single or multiple-fault-plane model. An inappropriate assumption of fault geometry would tend to distort the solution due to Green’s function modelling errors. We developed a new inversion method to extract information on fault geometry along with the slip-rate function from observed teleseismic waveforms. In this method, as in most previous studies, we assumed a flat fault plane, but we allowed arbitrary directions of slip not necessarily parallel to the assumed fault plane. More precisely, the method represents fault slip on the assumed fault by the superposition of five basis components of potency-density tensor, which can express arbitrary fault slip that occurs underground. We tested the developed method by applying it to real teleseismic P waveforms of the MW 7.7 2013 Balochistan, Pakistan, earthquake, which is thought to have occurred along a curved fault system. The obtained spatiotemporal distribution of potency-density tensors showed that the focal mechanism at each source knot was dominated by a strike-slip component with successive strike angle rotation from 205° to 240° as the rupture propagated unilaterally towards the south-west from the epicentre. This result is consistent with Earth’s surface deformation observed in optical satellite images. The success of the developed method is attributable to the fact that teleseismic body waves are not very sensitive to the spatial location of fault slip, whereas they are very sensitive to the direction of fault slip. The method may be a powerful tool to extract information on fault geometry along with the slip-rate function without requiring detailed assumptions about fault geometry.

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Content Repurposing for Small Devices

Encyclopedia of Multimedia Technology and Networking ◽

10.4018/978-1-59140-561-0.ch017 ◽

2011 ◽

pp. 110-115

Author(s):

Neil C. Rowe

Keyword(s):

Real Time ◽

Automated Planning ◽

High Rate ◽

Handheld Devices ◽

Personal Digital Assistants ◽

Web Page ◽

Multimedia Delivery ◽

Video And Audio ◽

New Devices

Content repurposing is the reorganizing of data for presentation on different display hardware (Singh, 2004). It has been particularly important recently with the growth of handheld devices such as personal digital assistants (PDAs), sophisticated telephones, and other small specialized devices. Unfortunately, such devices pose serious problems for multimedia delivery. With their tiny screens (150 by 150 for a basic Palm PDA or 240 by 320 for a more modern one, vs. 640 by 480 for standard computer screens), one cannot display much information (i.e., most of a Web page); with their low bandwidths, one cannot display video and audio transmissions from a server (i.e., streaming) with much quality; and with their small storage capabilities, large media files cannot be stored for later playback. Furthermore, new devices and old ones with new characteristics have been appearing at a high rate, so software vendors are having difficulty keeping pace. So some real-time, systematic, and automated planning could be helpful in figuring how to show desired data, especially multimedia, on a broad range of devices.

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