NDLI: Evidence for non-self-similarity in the M $_{ w }$ 7.7 2001 Bhuj earthquake sequence

Content Provider	Springer Nature Link
Author	Kumar, Manish Yallanki, V. S. Biswas, Koushik Mandal, Prantik
Copyright Year	2014
Abstract	Scaled energy, apparent stress, seismic moments, stress drops and corner frequencies are measured through the Levenberg–Marquardt nonlinear inversion modeling of S-wave displacement spectra for 489 selected earthquakes (M $_{ w }$ 2.05–5.52) from the 2001 M $_{ w }$ 7.7 Bhuj earthquake sequence. The iterative inversion scheme is formulated based on the ω-square source spectral model, which enabled us to estimate stable source parameters. The estimated seismic moment (M $_{ o }$) and source radius (r) vary from 1.5 × 10$^{12}$ to 2.4 × 10$^{17}$ to N m and 139.1–933.9 m, respectively, while estimated stress drops (Δσ) and the multiplicative factor (E $_{mo}$) values range from 0.1 to 14.4 MPa and 1.0–4.1, respectively. The corner frequencies (f $_{c}$) are found to be ranging from 1.4 to 9.3 Hz. The mean standard deviation for f $_{c}$, r and Δσ are estimated to be 0.7 Hz, 91.4 m and 2.9 MPa, respectively. The radiated seismic energy and apparent stresses range from 2.1 × 10$^{5}$ to 4.1 × 10$^{13}$ Joule and 0.005–8.0 MPa, respectively. Our estimated corner frequencies and seismic moments satisfy the relation M $_{ o }$ ∞ f c −(3+ε) , where ε (measure for a deviation from self-similarity) is found to be 1.33 for the larger earthquakes (M $_{ o }$ ≥ 2 × 10$^{15}$ N m), while the parameter ε is estimated to be 6.74 for smaller earthquakes (M $_{ o }$ < 2 × 10$^{15}$ N m). We feel that the larger value of ε may require to satisfy the increasing trend of scaled energy with moment for smaller earthquakes. We also notice that stress drops increase with seismic moment, approximately as Mo$^{3}$ (Δσ∝M $_{ o }$ $^{3}$) for smaller events (M $_{ o }$ < 10$^{15.3}$ N m), while for larger earthquakes (M $_{ o }$ ≥ 2 × 10$^{15}$ N m) stress drop increases approximately with M o 1 (Δσ∝M o 1 ). Adding credence to this non-self-similar theory, our estimated seismic moments and source radii (r) also reveal a break in the linear self-similar source scaling at M $_{ o }$ = 2 × 10$^{15}$ N m and r = 300 m, which is attributed to constant source radius for smaller earthquakes. Further, a comparative study between apparent stresses and static stress drops suggests a probable frictional overshoot mechanism for larger earthquakes, while smaller shocks are showing both partial stress drop and frictional overshoot mechanisms. We hypothesize that larger events are probably subject to the regional state-of-stress and fluid flow in the fault zone, whereas smaller earthquakes are sensitive to the local state-of-stress associated with material heterogeneities and fluid flows within the fault zone. We also propose that the relations developed in this study could be useful for accessing proper seismic hazard in the region.
Starting Page	1577
Ending Page	1598
Page Count	22
File Format	PDF
ISSN	0921030X
Journal	Natural Hazards
Volume Number	75
Issue Number	2
e-ISSN	15730840
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-09-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Source scaling Static stress drops Apparent stress Seismic moment Non-self-similarity Intraplate seismicity Natural Hazards Hydrogeology Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Civil Engineering Environmental Management
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Water Science and Technology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Triggered/migrated seismicity due to the 2001 M $_{w}$7.7 Bhuj earthquake, Western India

Low Coda Q c in the Epicentral Region of the 2001 Bhuj Earthquake of M w 7.7

Estimation of Source Parameters for the Aftershocks of the 2001 Mw 7.7 Bhuj Earthquake, India

The October 20, 2011 M$_{w}$ 5.1 Talala earthquake in the stable continental region of India

Post-seismic deformation associated with the 2001 Bhuj earthquake

Source parameters and scaling relations for small earthquakes in the Kachchh region of Gujarat, India

The reality of the scaling law of earthquake-source spectra?

Magnitude M $_{w}$ in metropolitan France

Estimation of Site Response in Kachchh, Gujarat, India, Region Using H/V Spectral Ratios of Aftershocks of the 2001 Mw 7.7 Bhuj Earthquake

Evidence for non-self-similarity in the M $_{ w }$ 7.7 2001 Bhuj earthquake sequence

Similar Documents

Triggered/migrated seismicity due to the 2001 M $_{w}$7.7 Bhuj earthquake, Western India

Low Coda Q c in the Epicentral Region of the 2001 Bhuj Earthquake of M w 7.7

Estimation of Source Parameters for the Aftershocks of the 2001 Mw 7.7 Bhuj Earthquake, India

The October 20, 2011 M$_{w}$ 5.1 Talala earthquake in the stable continental region of India

Post-seismic deformation associated with the 2001 Bhuj earthquake

Source parameters and scaling relations for small earthquakes in the Kachchh region of Gujarat, India

The reality of the scaling law of earthquake-source spectra?

Magnitude M $_{w}$ in metropolitan France

Estimation of Site Response in Kachchh, Gujarat, India, Region Using H/V Spectral Ratios of Aftershocks of the 2001 Mw 7.7 Bhuj Earthquake

Evidence for non-self-similarity in the M $_{ w }$ 7.7 2001 Bhuj earthquake sequence