Earthquakes near Albuquerque, New Mexico, 1976–1981

Jaksha, Lawrence H.; Sanford, Allan R.

doi:10.1029/jb091ib06p06293

Cited by 10 publications

(3 citation statements)

References 25 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A pronounced trend of upper crustal earthquakes along the Jemez lineament [Jaksha and Sanford, 1986] is further evidence for active tectonism there. The composite focal mechanism for these earthquakes [Jaksha and Sanford, 1986] has an axis of extension at about N50øW. The preferred fault plane, with left-lateral, strike-slip faulting, strikes subparallel to the Jemez lineament, with a strike of N78øE.…”

Section: Much Of the Volcanic Rock Of The Jemez Lineament Is Alkalic supporting

confidence: 62%

“…The latter result is interpreted as due to magma in the crust along the Jemez lineament [Ander, 1980;Aldrich et al, 1981;Ander et al, 1984]. A pronounced trend of upper crustal earthquakes along the Jemez lineament [Jaksha and Sanford, 1986] is further evidence for active tectonism there. The composite focal mechanism for these earthquakes [Jaksha and Sanford, 1986] has an axis of extension at about N50øW.…”

Section: Much Of the Volcanic Rock Of The Jemez Lineament Is Alkalic mentioning

confidence: 98%

See 1 more Smart Citation

A tomographic glimpse of the upper mantle source of magmas of the Jemez Lineament, New Mexico

Spence¹,

Gross

1990

J. Geophys. Res.

View full text Add to dashboard Cite

The 800-km-long Jemez lineament is the most active volcanic feature in the southwestern United States. It is the southeastern tectonic boundary of the Colorado Plateau and crosses the Rio Grande rift at the Jemez Mountains. The primary volcanism of the lineament is basaltic and has occurred in the last 4.5 m.y. To infer spatial distributions of partial melt in the upper mantle source zones for the Rio Grande rift and the Jemez lineament, we investigated the lateral variations of P wave velocity in the upper mantle beneath these features. We used teleseismic P wave delays recorded at a 22-station network to perform a damped least squares, three-dimensional inversion for these lateral variations. Our technique employed velocity interpolation within a three-dimensional grid of points, rather than using blocks of constant P wave velocity. This method allows highly realistic computation of seismic ray paths as well as accurate computation of the matrix elements in our system of equations. Determinations of resolution of results were done in two independent ways, both of which gave consistent estimates of resolution. In our best resolved volume the inversion showed no significant concentration of relative low velocity for P waves beneath the Rio Grande rift. However, directly beneath the Jemez lineament there is a -• 100-km-wide, 1-2% low-velocity feature in the depth range of 50-160 km. Because of the association of the low P wave velocity with the Jemez volcanic lineament but not with the Rio Grande rift, because lowered P wave velocity can be associated with increased partial melt, and because the volume of recent volcanism at the lineament greatly exceeds that at the rift, we infer that a large magmatic source zone exists beneath the Jemez lineament but not beneath the Rio Grande rift. This implies that the volcanic potential of the Jemez lineaments continues to greatly exceed that of the Rio Grande rift. The mantle source zones for volcanics of the Jemez lineament are not overridden by, but rather track, the motion of the North American plate; this implies that these sources are within the lithospheric plate, as is clarified in the discussion. The magmatic source zones of the Jemez lineament are modeled as due to clockwise rotation of the Colorado Plateau about a pole in northeastern Colorado. This rotation caused extension of the lithosphere beneath the Jemez lineament, permitting concentration there of partially melted rock in the upper mantle. ], crossing the Rio Grande rift at the Jemez volcanic center. Most of the volcanism along the lineament has occurred within the last 4.5 m.y. [Lipman, 1981; Aldrich and Laughlin, 1984; Smith and Luedke, 1984; Baldridge et al., 1987; Perry et al., 1987, 1988]. Hamilton and Myers [1966] indicate that changes in direction of extension within the Basin and Range led to a clockwise rotation of the Colorado Plateau, and Aldrich and Laughlin [1984] indicate that the timing of these changes corresponds to the timing of volcanism along the Jemez lineament. The Jemez lineament is t...

show abstract

Section: Much Of the Volcanic Rock Of The Jemez Lineament Is Alkalic supporting

confidence: 62%

Section: Much Of the Volcanic Rock Of The Jemez Lineament Is Alkalic mentioning

confidence: 98%

A tomographic glimpse of the upper mantle source of magmas of the Jemez Lineament, New Mexico

Spence¹,

Gross

1990

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Analysis of one thousand earthquakes revealed that most seismic activity falls into three areas: (1) The Socorro and Albuquerque areas of the Rio Grande Rift, (2) the Mount Taylor area, and (3) the Estancia Basin (Jaksha and Sanford, 1986). This analysis indicates that moderate damage is a reasonable expectation, if an earthquake occurs, but earthquakes are of rare incidence.…”

Section: Seismologymentioning

confidence: 99%

Sandia National Laboratories/New Mexico Environmental Baseline update--Revision 1.0

1996

View full text Add to dashboard Cite

The purpose of this Sandia National Laboratories/New Mexico (SNL/NM) Environmental Baseline Update is to provide the background information necessary for SNL/NM personnel and contractors to prepare clear and concise NEPA documentation. The scope of the Environmental Baseline Update is to provide comprehensive data needed to support a description of the affected environment at the SNL/NM facility. The "description of the affected environment,'' required by the CEQ regulations in 40 CFR $ 1502.15, is an essential prerequisite for assessing the environmental consequences ($1 502.18) of a proposed action (project) to be implemented by SNL/NM. Table 2- (Continued) . . List of Tables List of Tables (Continued) List of Figures 12-5Technical PrefaceSection 102(2)(c) of the National Environmental Policy Act (NEPA) requires agencies to:(1)nclude in every recpmmendation or report on proposals for . . . The purpose of this Sandia National Laboratories/New Mexico (SNL/NM) Environmental Baseline Update is to provide the background information necessary for SNLNM personnel and contractors to prepare clear and concise NEPA documentation. The scope of the Environmental Baseline Update is to provide the comprehensive data needed to support a description of the affected environment at the SNLLNM facility. The "description of the affected environment,"required by the CEQ regulations in 40 CFR 0 1502.15, is an essential prerequisite for assessing the environmental consequences (9 1502.16) of a proposed action (project) to be implemented by SNLNM. Appendix A of the Environmental Baseline Update summarizes the CEQ requirements for the format and contents of a NEPA document (40 CFR Part 1502). Appendix A also summarizes the relationship of NEPA to other federal environmental laws, and how the requirements of other statutes, regulations, and executive orders (EO) are to be addressed in a NEPA document.It is intended that this Environmental Baseline Update be used as a source document for preparing environmental descriptions in environmental checklists/action description memoranda, EAs, and EISs. The CEQ regulations specify that "descriptions shall be no longer than necessary to understand the effects of the alternatives" (9 1502.15). Some of the environmental descriptions (e.g., noise and visual resources) will not be relevant to every proposed action.Normally, a section in a NEPA document is devoted to a list of persons or organizations/ agencies contacted during the preparation of the document, as well as a list of preparers. In this Environmental Baseline Update, Chapter 14.0 includes the list of such organizations. SNL/NM xvi personnel or contractors may find the list to be a useful reference in preparing future NEPA documentation. In addition, Department 73 15, Risk Management and NEPA, at SNL/NM maintains a NEPA Compliance Guide (SAND95-1648) that provides direction on the preparation of NEPA documents (Hansen, 1995).Additional information that may be helpful in the preparation of NEPA document...

show abstract