11 Apr 2020, 12:42 (UTC +7) from Jakarta selatan:
I heard a loud noise for one or two hours. Around 1.00am to 3.00am on 11 April 2020, the birds were agitated. Thank you. (submitted by: anonymous)
22 Sep 2018, 18:15 (UTC +7) from Boat, near Kakatau mother (4.7 km S from volcano):
Strong Stromboli every 15-30sec (submitted by: Malmo)