群発

1. Origins, structure, and basic meaning

• Structure: 群発(ぐんぱつ) means similar events occurring in a cluster within a particular area or period.
• Basic usage: It describes patterns such as clusters of small earthquakes or seizures occurring in succession.

2. Common pitfalls and similar expressions

• Occurrence and clustering
  • 発生(はっせい) means an occurrence; 群発 emphasizes repeated events clustered together.
• が marks what occurs
  • In 発作が群発する, が marks seizures as the events occurring in succession.