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Gravimetric Parameters Catalog – General Description

Gravimetric Parameters Catalog contains data from the Seismic catalog and Gravimetric catalog through the event ID. That data format can be made using the application Catalog builder.

The catalog is a variable in the Matlab format file and it is kept in a file MAT. The structure is an array with named fields that can contain data of various types and sizes. In the file there is only one variable, the file name and variable name are optional.
The format of the Gravimetric Parameters Catalog is made in the same manner as catalog of seismic events and the Ground Motion Parameters Catalog.

The variable describing the catalog is a vector of structures, consisting of fields:

  • field – name of field in the catalog (text value);
  • type – a type of field in the catalog and way of showing the field (numeric value);
  • val – column array of values. For the text the column is an array type cell with text fields. For the remaining value, the column is a numeric column.
  • unit – description of the unit for individual data (text value).
  • description – short description of the parameter (text value).
  • fieldType – semantic meaning of the field. When some field values are similar/related then fieldType name is entered and for another case [] is entered.

The fundamental is a full catalog i.e. the variable contains the definitions of all specified fields. When some field values are missing then for the numeric data NaN (not specified) is entered and for the text null [] is entered.
The Gravimetric Parameters Catalog contains as many fields as Seismic Catalog and Gravimetric Catalog contain plus one additional - epicentral distance. Epicentral distance is calculated based on coordinates of events and stations which measured that event.
In the fields describing the events ("ID", "Time", "Lat", "Long" and at least one of Magnitude), the place of measurement ("RID", "SID", "S_name", "S_Lat", "S_Long", "S_Elevation", "R_time") and at least one of the fields of gravimetric measurements and epicentral distance values in all rows must be present.

Field

Type

Val

unit

description

FieldType

Comments

Data format

EID

3

data vector


Event ID


required field from Seismic Catalog

text

Time

5

data vector


Event origin time


required field from Seismic Catalog, Matlab serial numerical time

double

Lat

14,15,24,25

data vector

deg

Latitude


required field from Seismic Catalog deg – North positive

double

Long

14,15,24,25,34,35

data vector

deg

Longitude


required field from Seismic Catalog deg – East positive

double
Depth11-13data vectorkmHypocenter depth measured from the ground level
Hypocenter depth counted downwards from the surface (positive values below the surface)double
Elevation13data vectorkmHypocenter elevation measured over the see level
Hypocenter elevation counted upwards from sea level (positive values above sea level, negative values below sea level)double

Mw

4

data vector


Moment magnitude

'Magnitude'

required field from Seismic Catalog when any other Magnitude is unavailabledouble

ML

4

data vector


Local magnitude

'Magnitude'

required field from Seismic Catalog when any other Magnitude is unavailabledouble

RID

3

data vector


Registration ID


required field. ID must be linked to the name of the gravimetric record

text

SID

3

data vector


Station ID


required field

text

S_name

3

data vector


Station name


required field

text

S_Lat

24,25

data vector

deg

Station latitude


required field

double

S_Long

24,25,34,35

data vector

deg

Station longitude


required field

double

S_Elevation

10

data vector

m

Station elevation


required field

double

R_Time

5

data vector


Registration occurrence time


required field

double

Epicentral_dist22data vectorkmEpicentral distance between event and station
required fielddouble

Dg

23

data vector

uGal

Gravity field acceleration change
required field

double

V

23

data vector

um/s

Velocity of ground motion change due to gravity (vertical component)


required field

double
P23data vectorumPosition - displacement of ground due to gravity   (vertical component)
required fielddouble

Table 1. The general parameters in catalog MAT format.

Except for the general parameters described in the table above, the Gravimetric Parameters Catalog can contain other parameters in accordance with the Seismic Catalog, the Gravimetric Catalog, or the Ground Motion Catalog.

The Numbers of Data type:
1 – the real data without limits,
2 – the integer data,
3 – text value,
4 – the real number rounded to 0.1 (shown as 11),
5 – time in Matlab format serial time – the time display format; seconds with accuracy 1/10,
6 – the real data display in an engineering manner with one decimal place, e.g.: 3.5E6, (obsolete, recommended 2cd)
7 – the real data display in an engineering manner with two decimal place, (obsolete, recommended 2cd)
bc – (b and c are code digits) the real data display in fix-point manner with at minimum b places before decimal and c decimal place
e.g. For number 3.149.
10: „3”
11: „3.1”
12: „3.15”
20: „03”
23: „03.149”
1bc– the same manner as bc, but with place for a sign (space for sign „+”, sign - for sign „-”)
2cd– (c and d are code digits), the real data is displayed in an engineering manner, with place for a sign (space for sign „+”, sign ‘-’ for sign „-”), with c decimal place and exponent expressed by d places. The sign in exponent is always displayed.
e.g. For number 0.001:
211: „1.0E-3”
221: „1.00E-3”
212: „1.0E-03”
222: „1.00E-03”
e.g. For number 1000:
211: „1.0E+3”
221: „1.00E+3”
212: „1.0E+03”
222: „1.00E+03”

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