scholarly journals Ten kilometer vertical Moho offset and shallow velocity contrast along the Denali fault zone from double-difference tomography, receiver functions, and fault zone head waves

2017 ◽  
Vol 721 ◽  
pp. 56-69 ◽  
Author(s):  
A.A. Allam ◽  
V. Schulte-Pelkum ◽  
Y. Ben-Zion ◽  
C. Tape ◽  
N. Ruppert ◽  
...  
Keyword(s):  
Fault Zone ◽  
Receiver Functions ◽  
Double Difference ◽  
Denali Fault ◽  
Head Waves

Crustal and Upper Mantle Deformation Beneath Northwestern part of North Anatolian Fault Zone from Harmonic Decomposition of Receiver Functions

2020 ◽  
Author(s):  
Derya Keleş ◽  
Tuna Eken ◽  
Andrea Licciardi ◽  
Tuncay Taymaz
Keyword(s):  
Fault Zone ◽  
Seismic Anisotropy ◽  
Receiver Functions ◽  
North Anatolian Fault ◽  
Northwestern Part ◽  
North Anatolian Fault Zone ◽  
The North ◽  
Harmonic Decomposition ◽  
Harmonic Components ◽  
Depth Ranges

<p>A proper understanding of crustal seismic anisotropy beneath the tectonically complex northwestern part of the North Anatolian Fault Zone (NAFZ) will shed light into the depth extent of deformation zones. To investigate the seismic anisotropy in the crustal part of the NAFZ, we applied the harmonic decomposition technique on receiver functions from teleseismic earthquakes (with epicentral distances between 30° and 90°) recorded at the Dense Array for North Anatolia (DANA) seismic network. Harmonic coefficients, k=0, k=1, and k=2 were obtained by applying the harmonic decomposition method to the depth migrated receiver functions. Results from k=0 harmonics suggest south to north (e.g. from Sakarya Zone to Istanbul Zone) increase in crustal thickness. The depth variations of energy associated with k=1 and k=2 harmonic components imply significant lateral variation. For instance, the energy calculated for k=1 harmonics in the north (Istanbul Zone) indicates that seismic anisotropy is likely concentrated in the upper crust (within the first 15 km). However, further south, the signature of anisotropy in Armutlu-Almacik and Sakarya Zones becomes more significant in close proximity to the fault zone and dominates at greater (15-30 km and 30-60 km). Furthermore, k=2 harmonic energy maps exhibit relatively high intensities nearby the fault for all depth ranges.</p>

scholarly journals Seismotectonic setting at the North Anatolian Fault Zone after the 1999 Mw=7.4 Izmit earthquake based on high-resolution aftershock locations

2008 ◽  
Vol 14 ◽  
pp. 85-92 ◽  
Author(s):  
M. Bohnhoff ◽  
F. Bulut ◽  
E. Görgün ◽  
C. Milkereit ◽  
G. Dresen
Keyword(s):  
High Resolution ◽  
Fault Zone ◽  
Wide Band ◽  
North Anatolian Fault ◽  
Double Difference ◽  
North Anatolian Fault Zone ◽  
Coseismic Slip ◽  
The North ◽  
Northwestern Turkey ◽  
Better Than

Abstract. The most recent devastating earthquakes that occurred along the North Anatolian Fault Zone (NAFZ) in northwestern Turkey were the 1999 Izmit (Mw=7.4) and Düzce (Mw=7.1) events. In this study we present a catalog of Izmit aftershock hypocenters that was deduced from a network covering the entire 140 km long rupture of the mainshock. 7348 events with a location accuracy better than 5 km are analysed. Aftershocks were observed along the entire ruptured segment along a 20 km wide band of activity. Events are clustered in distinct regions and dominantly occur at 5 to 15 km depth. The eastern termination of the Izmit rupture is characterized by a sharp and steeply dipping boundary exactly where the Düzce mainshock initiated 87 days after the Izmit event. Relocation of the events using double-difference technology results in 4696 high-resolution hypocenters that allow resolving the internal structure of the seismically active areas with a resolution of 300 m (horizontal) and 400m (vertical). Below the Akyazi Plain, representing a small pull-apart structure at a triple junction of the NAFZ, we identify planes of activity that can be correlated with nodal planes of EW extensional normal faulting aftershocks. Along the easternmost Karadere-Düzce segment we identify the down-dip extension of the Karadere fault that hosted about 1 m of right-lateral coseismic slip. At the easternmost rupture we correlate a cloud-type distribution of seismic activity with the largest aftershocks in this area, a subevent of the Izmit mainshock and the Düzce mainshock that all have an almost identical focal mechanism. This part of the NAFZ is interpreted as a classical example of a seismic barrier along the fault.

scholarly journals Earthquake Relocation in Northern Bali Island in 2015-2017 using Double Difference Method (DD)

2018 ◽  
Vol 19 (2) ◽  
pp. 64
Author(s):  
Nandaru Diaz ◽  
Komang Ngurah Suarbawa ◽  
Adityo Mursitantyo
Keyword(s):  
Fault Zone ◽  
Difference Method ◽  
Accurate Result ◽  
Seismic Analysis ◽  
High Accuracy ◽  
Double Difference ◽  
Earthquake Relocation ◽  
Time Value ◽  
Earthquake Distribution ◽  
Real Value

A research about earthquake relocation in Northern Bali Island in 2015 – 2017 using the Double Difference (DD) method has been carried out. Earthquake relocation is important to get some informations about earthquake locations with high accuracy, fault zone identification, earthquake distribution and seismic analysis. The results of the relocation indicated that there was a displacement of the location of earthquake that formed moving closer to the earthquake source namely a fault. Relocation using HypoDD program gave high accurate result indicated by the RMS residual time value close to zero e.g. 0,000 - 0.01 which mean the results of calculations and observations are closed to the real value.

A Study on Crustal Anisotropy Using P to S Converted Phases of Receiver Functions: Application to Ailaoshan-Red River Fault Zone

2006 ◽  
Vol 49 (2) ◽  
pp. 383-393 ◽  
Author(s):  
Zhen XU ◽  
Ming-Jie XU ◽  
Liang-Shu WANG ◽  
Jian-Hua LIU ◽  
Kai ZHONG ◽  
...  
Keyword(s):  
Fault Zone ◽  
Receiver Functions ◽  
Red River ◽  
Crustal Anisotropy ◽  
Converted Phases ◽  
Red River Fault
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