Landslide initiation locations in La Tinta quadrangle, Guatemala

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/01-443/La_Tinta/ip22614.faq.html
Description This cover contains initiation location of landslides formed during Hurricane Mitch in October - November 1998. Locations were identified by manually selecting the upslope location of the landslides in the cover ls21614.
Originators Bucknam, Robert C.; Coe, Jeffrey A.; Mota, Manuel Antonio; Godt, Jonathan W.; Tarr, Arthur C.; Bradley, Lee-Ann; Rafferty, Sharon A.; Hancock, Dean; Dart, Richard L.; and Johnson, Margo L.
Publication U.S. Geological Survey Open-File Report 01-443

Related topics

States or counties

Overview of attributes

>
>ITEMS IN MARPITS1.PAT:
>
>COLUMN   ITEM NAME     WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
>    1  AREA                4    12     F      3
>    5  PERIMETER           4    12     F      3
>    9  MARPITS1#           4     5     B      -
>   13  MARPITS1-ID         4     5     B      -
>   17  PITNUM              5     6     C      -
>   22  ORDER               4     5     I      -
>   26  MAP                 2     3     C      -
>   28  QTR                 2     3     C      -
>   30  SEC                 2     3     C      -
>   32  TWP                 3     4     C      -
>   35  RNG                 3     4     C      -
>   38  HI_CLASS            4     5     C      -
>   42  MATERIAL           30    31     C      -
>   72  PI                  4     5     C      -
>   76  ABR_500             4     5     I      -
>   80  SWELL_24            7     8     N      2
>   87  THR_QTR             4     5     I      -
>   91  NUM_4               4     5     I      -
>   95  NUM_8               4     5     I      -
>   99  NUM_40              4     5     I      -
>  103  NUM_200             4     5     I      -
>  107  SOURCE              4     4     I      -
>
> BRIEF EXPLANATION OF ITEMS ADDED BY THE AUTHORS TO THE
> MARPITS1 POINT DATA SET:
> (items automatically generated by ArcInfo not detailed)
>---------------------------------------------------------
> PITNUM -The pit number of the location.
>
> ORDER -The ascending numeric order of the pit number.
>
> MAP -The map sheet (from Source) of the pit.
>
> QTR -Public Land Survey quarter-section or half-section of
>      the pit location.  nw = northwest, ne = northeast,
>      sw = southwest, se = southeast, w2 = western-half,
>      n2 = northern-half and so on.
>
> SEC -Public Land Survey section of the pit location.
>
> TWP -Public Land Survey township of the pit location.
>
> RNG -Public Land Survey range of the pit location.
>
> HI_CLASS -Highest classification for material found in the pit.
>           The following are the highest class designations for
>           test data representing at least half or more of the
>           total depth of the pit:
>           MA--mineral aggregate
>           AB--aggregate base
>           SM--select material
>           BR--borrow, no limits set
>           CM--cover material (no specification provided)
>           SB--special backfill (no specification provided)
>           SS--subgrade seal
>           UK--unknown
>
> MATERIAL -Material types (clay, sand, gravel, caliche, etc.
>           Abreviations used for various materials found in
>           each pit: [Classification scheme includes a mix of
>           material types (ash, caliche, cinder, clay) and
>           classification of material by size (boulders, silty)]
>           ASH--ash; AND--andesite; BLDR--boulders;
>           BST--basalt, malpais; CAL--caliche; CDR--cinders;
>           CGM--conglomerate; CKR-clinkers; CLY--clay;
>           COB--cobbles; DEC--decomposed; DIRT--dirt;
>           GTE--granite; GVL--gravel; GYP--gypsum; LAV--lava;
>           LOM--loam; LST--limestone; PUM--pumice; RCK--rock;
>           RHY--rhyolite; SH--shale; SLT--silt; SLTY--silty;
>           SND--sand; SS--sandstone; TRAV--travertine
>         *Note that many of these abbreviations may not be
>          found in the data as this list is applicable to data
>          for all counties for which data has been collected.
>
> PI -(Plasticity Index) A measure of sensitivity that aggregate
>     has to moisture change and is important when aggregate is
>     used in Portland cement or asphalt concrete. White (1991,
>     p. 13-42) defines PI as "the difference in the Atterberg
>     liquid limit and plastic limit moisture contents." It is a
>     value without a unit.  A PI of 4 is the maximum allowed as
>     stipulated in American Society of Testing Material (ASTM)
>     test D 3515 for materials used in asphalt concrete mixtures
>     (White, 1991). The Arizona Highway Department (1972) used
>      several PI standards.  These include ones where PI was not
>     detected or was to be less than 5 or 10 depending on
>     aggregate classification.  Testing was to be executed in
>     accordance with the requirements of American Association
>     of State Highway and Transportation Officers T 90
>     (AHD, 1972).  Maximum allowable PI values are dependent on
>     which of the 50 categories of aggregate types are in effect.
>     When testing determined no PI, a "NP" (no plasticity) was
>     entered in the ADOT (1977) table. The Open-File Report
>     authors have changed all these "NP" to zero and entered
>     -999 when fields were without values.
>
> ABR_500 -Los Angeles (LA) abrasion test (500 rotations).
>          The test used to evaluate the resistance of a coarse
>          aggregate to degradation by abrasion and impact is the
>          Los Angeles abrasion test (Meyer and Zeinak 1991).
>          In accordance with ADOT (1990, p. 718) standard
>          specifications "the percent of wear of coarse aggregate
>          at 500 revolutions, when tested in accordance with the
>          requirements of American Association of State Highway
>          Transportation Officials (AASHTO) test T 96, shall not
>          exceed 40."  The same requirement is also specified for
>          the class of aggregate 1 to 4 for material used in
>          subbases and bases (ADOT, 1990, p. 140).  The detail of
>          Los Angeles abrasion testing procedures may have
>          changed so the results found in this data release may
>          not be consistent with current specifications.
>          Los Angeles abrasion test results are found in just 8
>          percent of the pits listed in the inventory.
>
> SWELL_24 -Volume change--swell (24 hours).
>           Data are available giving maximum 24-hour volume
>           change (AHD, 1972).  Procedures and standards
>           applicable at the time of the test are not given in
>           the inventory but likely may have been AASHTO 101,
>           Method B (AHD, 1972, Table 703-1 and 704-1).  These
>           specifications set the maximum allowed volume increase
>           to 0.06.  This is the maximum for all classes of
>           mineral aggregate and one class of aggregate used for
>           cover materials and slurry seal.
>
> THR_QTR -Percent material passing the 3/4 inch sieve. Materials
>          passing the 3/4 inch mesh sieve are 19 mm or less.
>
> NUM_4 -Percent material passing the no. 4 sieve. Materials
>        passing the no. 4 mesh sieve are 4.75 mm or less.
>
> NUM_8 -Percent material passing the no. 8 sieve. Materials
>        passing the no. 8 mesh sieve are 2.338 mm or less.
>
> NUM_40 -Percent material passing the no. 40 sieve. Materials
>         passing the no. 40 mesh sieve are 0.42 mm or less.
>
> NUM_200 -Percent material passing the no. 200 sieve. Materials
>          passing the no. 200 mesh sieve are less than 0.074 mm.
>
> SOURCE  -Numeric value that relates to marpits1.ref look-up
>          table giving information on the Source.
>

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