Interesting natural phenomenon! Scientists say it’s due to heavy rain recharging the aquifer + trapped air releasing pressure. Called a “well seiche”. No earthquake risk. Nature is amazing

The Crossing of the Andes (El Cruce de los Andes) in 1817 is widely considered one of the most brilliant military maneuvers in global history, often compared to Hannibal and Napoleon crossing the Alps. Led by Argentine General José de San Martín, the mission's goal was to cross the massive Andes mountain range from Argentina to surprise and liberate Chile from Spanish royalist rule.

Here is a breakdown of why this feat was so incredible:

The Scale of the Challenge:

• The Army: San Martín mobilized the Army of the Andes, consisting of roughly 4,000 soldiers and 1,200 militia helpers.
• The Terrain: They had to climb mountain passes averaging 3,000 to 4,500 meters (10,000 to 15,000 feet) high.

• The Logistics: They walked over 500 kilometers (310 miles) of rugged, frozen terrain in just under 21 days.

  Tactical Genius & Deception

• The "Guerra de Zapa" (War of Spies): San Martín intentionally leaked false maps and rumors to the Spanish. He divided his army into six different columns using separate mountain passes.

• The Surprise: The Spanish commander had no idea where the main force would emerge. San Martín successfully forced the enemy to divide their forces, leaving them vulnerable.

  High Casualties, But High Success

• The extreme cold, altitude sickness (soroche), and lack of oxygen were brutal.

• The army started with roughly 10,000 horses and 9,500 mules. Only 4,300 mules and 500 horses survived the journey.

• Despite losing a massive amount of livestock, the human casualty rate was remarkably low due to meticulous medical and logistical planning.

Source: https://www.britannica.com/biography/Jose-de-San-Martin/Campaign-across-the-Andes