What a Fright! (Sounds good to me, it is used here)

This afternoon, the strongest earthquake in 16 years hit Colombia. The magnitude 6,6 earthquake occured at 3:55 pm, and it was felt almost felt throughout almost all of Colombia. The epicentre was in a small town in the province of Santander named "La mesa de los santos". This town is known for being a place where every day there are small tremors. But today's earthquake was very strong. It was stronger than that that destroyed the cities of Armenia and Pereira in 1999. Earthquakes scare me a lot, because I was in my hometown close to Armenia the day when that earthquake badly destroyed Armenia.
Today, I felt as if I had been in one of those surveillance videos recorded in Japan while there is an earthquake. My desk shook violently, and my classmates and I looked at one another as if to ask "Is this really happening?"
Fortunetaly, nothing serious happened today owing to the earthquake. (OR, fortunaetly the earthquake did not cause any serious damage) Yet, it was very scary!

As always, excellent.

What a Fright! more native-- What a scare! How scary! How frightening!

This afternoon, the strongest earthquake in 16 years hit Colombia. The magnitude 6,6 earthquake occured at 3:55 pm, and it was almost felt throughout almost all of Colombia. The epicentre was in a small town in the province of Santander named "La mesa de los santos". This town is known for being a place where every day there are small tremors. But today's earthquake was very strong. It was stronger than that that destroyed the cities of Armenia and Pereira in 1999. Earthquakes scare me a lot, because I was in my hometown close to Armenia the day when that earthquake badly destroyed Armenia.
Today, I felt as if I had been in one of those surveillance videos recorded in Japan while there is an earthquake. My desk shook violently, and my classmates and I looked at one another like asking "Is this really happening?"
Fortunetaly, nothing serious happened today owing (prefiero due) to the earthquake. Yet, it was very scary!

What a fright!  I have not heard this but it is correct grammatically

Almost  adverbs are weird, i think in spanish and english, as to their placement. Sometimes it makes no difference, sometimes there is a stylistic difference but here, I think tienes que poner almost antes de "all", de otra forma, suena como la gente casi siente el tremor

that that para mí está bien

like asking una forma menos educada. Escribes demasiado bien decir esto.  ...looked at one another as if we were asking is this...

owing  Veo esto "owing" en otros escritos, me imagino, dónde los españoles aprenden "owing"? De los britannicos? Es correcto pero menos usada en comparación con "due"

Badly destroyed  creo que badly es redundante, como "muy gigantesco" mi profesor me dice, no hable eso

What a Fright!

This afternoon, the strongest earthquake in 16 years hit Colombia. The magnitude 6,6 earthquake occured at 3:55 pm, and it was almost felt throughout all of Colombia. The epicentre was in a small town in the province of Santander named "La mesa de los santos". This town is known for being a place where every day there are small tremors. But today's earthquake was very strong. It was stronger than the one which destroyed the cities of Armenia and Pereira in 1999. Earthquakes scare me a lot, because I was in my hometown close to Armenia the day when that earthquake badly destroyed Armenia.
Today, I felt as if I had been in one of those surveillance videos recorded in Japan while there is an earthquake. My desk shook violently, and my classmates and I looked at one another as though to ask: "Is this really happening?"
Fortunately, nothing serious happened today owing to the earthquake. Yet, it was very scary!

(This is very good, very well written. The only thing in the whole thing that reveals it's not your first language is that 'like asking'. The 'that that' isn't technically wrong, either; it's just awkward; going with 'the one which' just reads a little more nicely. Also: other phrases in place of 'as though to ask' are: 'as if to ask', 'as though we were asking'.)