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Journal Article

Crustal phases, HYPO71, and other programs

R. D. Adams
Published: 01 April 1991
Bulletin of the Seismological Society of America (1991) 81 (2): 699–700.
DOI: https://doi.org/10.1785/BSSA0810020699
...) . Replace the HYPO71 format . Bull. Seism. Soc. Am. 80 , 1043 - 1045 . Jeffreys H. Bullen K. E. (1940) . Seismological Tables , British Association , London...
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Journal Article

Replace the HYPO71 format

J. Havskov
Published: 01 August 1990
Bulletin of the Seismological Society of America (1990) 80 (4): 1043–1045.
DOI: https://doi.org/10.1785/BSSA0800041043
.... (1990) . Replace the HYPO71 format ? Bull. Seism. Soc. Am. 80 , 1046 - 1047 . Lee W. H. K. Lahr J. C. (1972) . HYPO71: A computer program for determining hypocenter...
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Journal Article

Replace the HYPO71 format?

W. H. K. Lee
Published: 01 August 1990
Bulletin of the Seismological Society of America (1990) 80 (4): 1046–1047.
DOI: https://doi.org/10.1785/BSSA0800041046
...W. H. K. Lee 22 3 1990 Copyright © 1990, by the Seismological Society of America Bulletin of the Seismological Society of America, Vol. 80, No. 4, pp. 1046-1047, August 1990 REPLACE THE HYPO71 FORMAT? BY W. H. K. LEE Havskov (1990) presented several reasons why the HYPO71 format...
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Journal Article

Error Estimates in Some Commonly Used Earthquake Location Programs

Thomas M. Boyd, J. Arthur Snoke
Published: 01 April 1984
Seismological Research Letters (1984) 55 (2): 3–6.
DOI: https://doi.org/10.1785/gssrl.55.2.3
... of the more widely used programs (HYPOELLIPSE, FASTHYPO, HYPO71, and HYPOINVERSE). In all the programs considered, an individual confidence interval is given for the depth error. For the epicentral error, HYPO71 and HYPOINVERSE provide only individual confidence estimates, while the other programs provide...
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Average rms versus V P &#x2F; V S ratio during the <span class="search-highlight">hypo71</span> location proce...

Average rms versus V P / V S ratio during the hypo71 location proce...

Published: 01 October 2010
Figure 3. Average rms versus V P / V S ratio during the hypo71 location procedure using 1978 selected events.
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Histogram of rms residual for 1402 events for (a) initial <span class="search-highlight">hypo71</span> locations ...

Histogram of rms residual for 1402 events for (a) initial hypo71 locations ...

Published: 01 October 2010
Figure 4. Histogram of rms residual for 1402 events for (a) initial hypo71 locations and (b) hypoDD relocations. The average rms was reduced from 0.24 in the initial locations to 0.10 in the relative relocations.
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Wadati diagram of Δ( S – P ) vs. Δ P , for <span class="search-highlight">HYPO71</span> A-quality earthquakes.

Wadati diagram of Δ( S – P ) vs. Δ P , for HYPO71 A-quality earthquakes.

Published: 01 October 2000
Figure 4. Wadati diagram of Δ( S – P ) vs. Δ P , for HYPO71 A-quality earthquakes.
Journal Article

HYPOCENTER: An earthquake location method using centered, scaled, and adaptively damped least squares

Barry R. Lienert, E. Berg, L. Neil Frazer
Published: 01 June 1986
Bulletin of the Seismological Society of America (1986) 76 (3): 771–783.
DOI: https://doi.org/10.1785/BSSA0760030771
...Barry R. Lienert; E. Berg; L. Neil Frazer Abstract We present an earthquake location method, HYPOCENTER, which combines features of the two well-known algorithms HYPO71 and HYPOINVERSE, with a new technique which we term adaptive damping. Each column of the linearized condition matrix T , which...
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Depth section of earthquakes along profiles AB and CD: (a) located using HY...

Depth section of earthquakes along profiles AB and CD: (a) located using HY...

Published: 01 August 2010
Figure 3. Depth section of earthquakes along profiles AB and CD: (a) located using HYPO71 and (b) relocated using hypoDD.
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Histograms represent the uncertainty in hypocentre parameters as a function...

Histograms represent the uncertainty in hypocentre parameters as a function...

Published: 22 February 2022
Figure 6 Histograms represent the uncertainty in hypocentre parameters as a function of (a) longitude, (b) latitude, and (c) depth. Blue bars correspond to Hypo71 output, and red bars correspond to the JHD output.
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▴ Histogram showing the distribution of the difference between moment tenso...

▴ Histogram showing the distribution of the difference between moment tenso...

Published: 01 September 2010
Figure 7. ▴ Histogram showing the distribution of the difference between moment tensor minimum misfit/CLVD depth and HYPO71 hypocentral depth for 684 events that were inverted.
Journal Article

Velocity Structure and Deep Earthquakes beneath the Kinnaur, NW Himalaya: Constraints from Relocated Seismicity and Moment Tensor Analysis

Shubhasmita Biswal, Sushil Kumar, Keith Priestley, W. K. Mohanty, Mahesh Prasad Parija
Journal: Lithosphere
Publisher: GSW
Published: 22 February 2022
Lithosphere (2021) 2021 (Special 6): 2834594.
DOI: https://doi.org/10.2113/2022/2834594
...Figure 6 Histograms represent the uncertainty in hypocentre parameters as a function of (a) longitude, (b) latitude, and (c) depth. Blue bars correspond to Hypo71 output, and red bars correspond to the JHD output. ...
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Tectonic map of Sikkim region showing the stations (triangles) and (a) loca...

Tectonic map of Sikkim region showing the stations (triangles) and (a) loca...

Published: 01 August 2010
Figure 2. Tectonic map of Sikkim region showing the stations (triangles) and (a) located (HYPO71) and (b) relocated (hypoDD) earthquakes. MBT, main boundary thrust; MCT, main central thrust ( Geological Survey of India, 2000 ). Profiles AB and CD used for plotting the depth sections are also
Journal Article

Capturing, Preserving, and Digitizing Legacy Seismic Data from the Montserrat Volcano Observatory Analog Seismic Network, July 1995–December 2004

Glenn Thompson, John A. Power, Jochen Braunmiller, Andrew B. Lockhart, Lloyd Lynch, Wendy McCausland, Charlotte A. Rowe, Thomas Shea, Randall A. White, Charles I. Breithaupt
Published: 27 May 2020
Seismological Research Letters (2020) 91 (4): 2127–2140.
DOI: https://doi.org/10.1785/0220200012
... rather overlooked. This article documents the evolution of the ASN, the VDAP system, the original data captured, and the recovery and conversion of more than 230,000 seismic events from legacy SUDS, Hypo71, and Seislog formats into Seisan database with waveform data in miniSEED format. No digital catalog...
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Seismotectonic map of the Kinnaur area. The right inset map shows the study...

Seismotectonic map of the Kinnaur area. The right inset map shows the study...

Published: 22 February 2022
Figure 1 Seismotectonic map of the Kinnaur area. The right inset map shows the study area bounded by a rectangle. Seismic stations (green solid triangles) and Hypo71 located seismicity (black solid circles) are indicated. MBT: Main Boundary Thrust; MCT: Main Central Thrust; STD: South Tibetan
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Cross sections along dashed lines shown in Figure  6 . In each panel, the u...

Cross sections along dashed lines shown in Figure  6 . In each panel, the u...

Published: 01 October 2010
Figure 7. Cross sections along dashed lines shown in Figure  6 . In each panel, the upper section shows relocated hypocenters and the lower shows the initial hypo71 hypocenters. Top right panel indicates an unknown fault corresponding to cluster 2. The topographical cross section is also shown
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Error distribution of the relocated IRSC catalog using two velocity models ...

Error distribution of the relocated IRSC catalog using two velocity models ...

Published: 01 October 2010
Figure 2. Error distribution of the relocated IRSC catalog using two velocity models (Table  2 ) and hypo71. We have truncated the dataset to those cases where hypocentral errors are less than 15 km. Open and filled bars represent errors associated with the velocity model of Abbassi et al
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Solutions obtained by considering independently the effect of each alternat...

Solutions obtained by considering independently the effect of each alternat...

Published: 07 July 2020
Figure 6. Solutions obtained by considering independently the effect of each alternative earthquake location software (colors and lines as in Fig.  4 ): (a) HYPOELLIPSE; (b) HYPOINVERSE; (c) HYPO71 only; (d) HYPOSAT only. All the other nodes are set assigning equal weights. In (a–d), the bottom
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Epicentral distribution of the final 1402 selected events for (a) initial h...

Epicentral distribution of the final 1402 selected events for (a) initial h...

Published: 01 October 2010
Figure 6. Epicentral distribution of the final 1402 selected events for (a) initial hypo71 location and (b) hypoDD relocation. The four clusters discussed in detail are indicated with numbers (1–4) and black circles. Black arrows indicate two distinct tightenings of events: one with strike gently
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(a) Projection of the fault‐plane solution determined using the least‐squar...

(a) Projection of the fault‐plane solution determined using the least‐squar...

Published: 25 September 2018
) and (c). The black square is the reference point (36.93° W, 5.85° S) for the x ‐axis (horizontal axis) in (b) and (c). The focal mechanism indicates the best solution obtained from FOCal MEChanism (FOCMEC) in this research. (b) Parallel and (c) perpendicular cross sections of the HYPO71 solutions