Group 1 - An 8.7 magnitude earthquake occurred in the Avacha Bay area of the Kamchatka Peninsula on July 30, leading to approximately 1000 aftershocks detected in the region [1] - The aftershocks ranged from the minimum measurable magnitude to about 7, with expectations of thousands more aftershocks in the coming months [1] - The Kamchatka Volcanic Natural Park reported an eruption of the Klyuchevskaya Sopka volcano following the earthquake, with ash reaching approximately 6000 meters above the crater [1] Group 2 - The earthquake caused a tsunami with wave heights reaching up to 5 meters, prompting the evacuation of around 2700 people to the Kuril Islands [1] - Flooding in the tsunami-affected areas has receded as of the same day [1] - Experts believe that the earthquake is likely the final phase of over a year of seismic activity in the Kamchatka region, with a low probability of larger earthquakes occurring within the year [1]

Core Points - The eruption of the Lewotobi volcano in eastern Indonesia has caused significant disruptions, including the cancellation and delay of multiple flights due to ash clouds reaching heights of 10,000 meters [1][2] - The Indonesian National Disaster Management Agency has raised the alert level to the highest due to the increasing intensity of the volcanic activity, prompting the evacuation of residents from nearby villages [1][2] - Authorities have closed roads leading to the volcano to ensure safety and have advised the public to avoid the area, particularly near rivers, to prevent secondary disasters such as mudflows and lava flows [1] Aviation Impact - Bali's Ngurah Rai International Airport reported cancellations and delays of international flights from Australia, Singapore, and India due to volcanic ash [1] - Several airports on Flores Island have also canceled multiple inbound and outbound flights, affecting domestic routes within Indonesia [1] Public Health Advisory - The Indonesian National Disaster Management Agency has advised residents to follow evacuation orders and to wear masks or use wet towels to cover their mouths and noses to reduce inhalation of volcanic ash [2]