Analyzing San Fernando Earthquake Ground Motion Analyzing San Fernando Earthquake Ground Motion

My Solutions $>$

In this problem, you are supposed to analyze and extract some basic features of an earthquake ground motion.

The files SFH$1.$txt$,$ SFH$2.$txt$,$ and SFV$.$txt contain two horizontal and one vertical acceleration components from San

Fernando earthquake $(1971)$ recorded at Via Tejon station. The records are obtained from PEER ground motion

database.

The following tasks are intended to be fulfilled:

$1.$Please start by loading the three componenets of the ground motion that are provided to you. You may use

texread$(\text{'}$file names'$)$ to load the data, and name veriables as SFH$1,$ SFH$2,$ and SFV$.$

The data are recorded at the time step of $0\mathrm{.}005$ second $($i$.$e$.,$ the spacing between $2$ adjacent timestamps is $0\mathrm{.}005s).$

Create a variable, Time, which starts from $t=0s$ and contains the timestamps of the same length as the other vectors

$($SFH$1,$ SFH$2,$ and SFV$).$

List data in a timetable for more convenience. Create a timetable with the time and three acceleration variables

and name it as quakeData. Display the first ten rows using the head function.

Choose first horizontal component of the ground motion amplitude $($SFH$1$ data$)$ and plot it against Time. Title this

figure as "First Horizontal Component".

Visualize the three acceleration components on three different axes. Use $31$ subplots to visulaize your data.

The speed of shockwave propagation is the integration of the accelerations over time. Use cumulative sums

$($cumsum$)$ along the time variable for SFH$1,$ SFH$2,$ and SFV to get the velocity of the wavefront. Name the velocity

veriables as VeISFH$1,$ VeISFH$2,$ and VeISFV, respectively.

Plot the $3$ components of the velocity against the time interval. Use $31$ subplots to plot the velocities.

My Solutions $>$

In this problem, you are supposed to analyze and extract some basic features of an earthquake ground motion.

The files SFH$1.$txt$,$ SFH$2.$txt$,$ and SFV$.$txt contain two horizontal and one vertical acceleration components from San

Fernando earthquake $(1971)$ recorded at Via Tejon station. The records are obtained from PEER ground motion

database.

The following tasks are intended to be fulfilled:

$1.$Please start by loading the three componenets of the ground motion that are provided to you. You may use

texread$(\text{'}$file names'$)$ to load the data, and name veriables as SFH$1,$ SFH$2,$ and SFV$.$

The data are recorded at the time step of $0\mathrm{.}005$ second $($i$.$e$.,$ the spacing between $2$ adjacent timestamps is $0\mathrm{.}005s).$

Create a variable, Time, which starts from $t=0s$ and contains the timestamps of the same length as the other vectors

$($SFH$1,$ SFH$2,$ and SFV$).$

List data in a timetable for more convenience. Create a timetable with the time and three acceleration variables

and name it as quakeData. Display the first ten rows using the head function.

Choose first horizontal component of the ground motion amplitude $($SFH$1$ data$)$ and plot it against Time. Title this

figure as "First Horizontal Component".

Visualize the three acceleration components on three different axes. Use $31$ subplots to visulaize your data.

The speed of shockwave propagation is the integration of the accelerations over time. Use cumulative sums

$($cumsum$)$ along the time variable for SFH$1,$ SFH$2,$ and SFV to get the velocity of the wavefront. Name the velocity

veriables as VeISFH$1,$ VeISFH$2,$ and VeISFV, respectively.

Plot the $3$ components of the velocity against the time interval. Use $31$ subplots to plot the velocities.Assessment: $3$ of $4$ Tests Passed $(75\%)$

Read the text data correctly?

Correct quakeData timetable?

Plotted all the data using subplot$()?$

Computed the wavefront velocity correctly?

Variable VeISFH$1$ has an incorrect value.