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Ground Motion Catalog – General Description


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 ground motion catalog is made in the same manner as a catalog of seismic events

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

  • field – name of field in the catalog (text value);
  • type – 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 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. In the fields "ID", "Time" and at least one of the fields "PGA" values in all rows must be present.

Table The general parameters in catalog MAT format

field

type

unit

description

fieldType

Comments

Data format

RID

3


Registration ID

 

required field. ID must be linked to the name of the signal accelerogram

text

EID

3


Event ID

 

required field. ID should be linked to catalog EID

text

Time

5


Event origin time
required field, Matlab serial numerical timedouble

SID

3


Station ID


required field

text

S_name

3


Station name


required field

text

S_Lat

24,25

deg

Station latitude


required field

double

S_Long

24,25,34,35

deg

Station longitude


required field

double

S_Elevation

10

m

Station elevation

 

required field

double

R_Time

5

days

Registration occurrence time


required field

double

PGA_E

13

m/s^2

Peak ground acceleration of E component

PGA

required field



double

PGA_N

13

m/s^2

Peak ground acceleration of N component

PGA

double

PVA

13

m/s^2

Peak vertical acceleration

PGA

double

PHA

13

m/s^2

Peak horizontal acceleration

PGA


double

PGA

13

m/s^2

Total peak ground acceleration

PGA


double

RMS_A

21

m/s^2

Root-mean-square acceleration

PGA


double

PGV_E

13

cm/s

Peak ground velocity of E component

PGV


double

PGV_N

13

cm/s

Peak ground velocity of N component

PGV


double

PVV

13

cm/s

Peak vertical velocity component

PGV


double

PHV

13

cm/s

Peak horizontal velocity

PGV


double

PGV

13

cm/s

Total peak ground velocity

PGV


double

RMS_V

21

cm/s

Root-mean-square velocity

PGV


double

PGD_E

13

mm

Peak ground displacement of E component

PGD


double

PGD_N

13

mm

Peak ground displacement of N component

PGD


double

PVD

13

mm

Peak vertical displacement component

PGD


double

PHD

13

mm

Peak horizontal displacement

PGD


double

PGD

13

mm

Total peak ground displacement

PGD


double

RMS_D

21

mm

Root-mean-square displacement

PGD


double

AI

6

m/s

Arias Intensity



double

NED

6

m/s^2

Normalized Energy Density



double

ABD

21

s

Absolute bracketed duration

Duration

A problem with absolute durations relies on that one must prescribe for them absolute criteria. Maybe they should not be included in the catalog but to implement an appropriate service to evaluate them?



double

AUD

21

s

Absolute uniform duration

Duration

double

AED

21

s

Absolute effective duration

Duration

double

RBD

21

s

Relative bracketed duration

Duration

For relative durations criteria must be prescribed too but here there is a general agreement for 5%



double

RUD

21

s

Relative uniform duration

Duration

double

RED

21

s

Relative effective duration

Duration

double

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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