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$.$

$2.$ The data are recorded at the time step of $0\mathrm{.}005$ second $($i$.$e$.,$ the spacing between $2$ adjacent timestamps is $0\mathrm{.}005$ s$).$ Create a variable, Time, which starts from and contains the timestamps of the same length as the other vectors $($SFH$1,$ SFH$2,$ and SFV$).$

$3.$ 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.

$4.$ Choose first horizontal component of the ground motion amplitude $($SFH$1$ data$)$ and plot it against Time. Title this figure as "First Horizontal Component".

$5.$ Visualize the three acceleration components on three different axes. Use $3$x$1$ subplots to visulaize your data.

$6.$ 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 VelSFH$1,$ VelSFH$2,$ and VelSFV, respectively.

$7.$ Plot the $3$ components of the velocity against the time interval. Use $3$x$1$ subplots to plot the velocities.