Two quakes with magnitudes higher than 6.0 struck Costa Rica (M6.1) and Indonesia (M6.5) within less than 8 hours on August 17, 2018, another very active day on the Ring of Fire.
A strong M6.1 earthquake shook southern Costa Rica at 5:22 p.m. local time at a depth of about 12 miles, on Friday evening, toppling items from store shelves and knocking out power in places. The epicenter was about 12 miles north of the town of Golfito, near the Panama border. The quake was felt strongly in the region.
In Panama, the quake was felt strongly in the border provinces of Chiriqui and Bocas del Toro, though there were no immediate reports of damage. It was also felt at a stadium in the city of David, where a youth baseball championship game was being played, but play was not halted.
You didn’t feel it – but the ground was shaking in #Victoria again late this afternoon… Seismic surface waves from a M6 earthquake in Costa Rica travelled 5770 km to a seismograph near downtown Victoria in just over 30 minutes!
— John Cassidy (@earthquakeguy) 18 août 2018
There are reports saying that in Puerto Jimenez the power was out and some power poles toppled. Aftershocks – at least one with a magnitude of 4.9 – were felt in the minutes afterward.
??➡#Sismo 6.0 #Temblor 17:22 PM H/TICA??
?Referencia a 14 Km al NorOeste de #SanVito
a 10 Km al Norte de #Golfito
y al SurEste de #SanJose
frontera con Panama#CostaRica?? #TemblorCR #Terremoto #Earthquake #BuenViernes pic.twitter.com/XS7nG1pEp7
— TEMBLOR⚡️ ?? (@ElLuchin1) 18 août 2018
Costa Rica’s National System for Monitoring Tsunamis ruled out a tsunami alert.
A few hours before a relatively deep offshore earthquake struck the Indonesian archipelago, 153km north-east of Raba at a depth of 564.7km. BMKG said there was no tsunami risk.
Some reports say the quake was felt in Bali, about 580 km from Raba.
The epicentre of Friday’s quake was around 500km from the island of Lombok, where two deadly tremors – and dozens of aftershocks – wreaked widespread damage earlier in the month.
Indonesia and Costa Rica see frequent earthquakes as they sit on the Ring of Fire.
M 6.5 – 109km NNW of Kampungbajo, Indonesia
M 6.1 – 17km N of Golfito, Costa Rica
Viva Noticias – Alerta: Fuerte terremoto sacude a Costa Rica y logra sentirse en Panamá
LA Times – Strong earthquake shakes southern Costa Rica
Channel News Asia – Magnitude-6.6 quake hits north-east of Raba, Indonesia: USGS