[M T]

I checked USGS’s earthquakes bigger than 2.5 an hour or two after the announcement and none were registered in Iran.

Quite possibly, the earthquake monitors are filtering out near-surface activity.

I’ve seen 1+ magnitude (depth of 0km) earthquakes registered in Santa Clara county mining ops clearly from man-made blasts. So I expected to see these bunker busters. 

I haven't seen a firm time of the bombing (I guess no one got invited to Signal!). Trump posted his announcement at 7:46 EDT (Sat 23:46 UTC).

Looking at a list of earthquakes in the vicinity of Iran (> 1, apparently)
lat/long day GMT Mag depth
(no earlier quakes on Sat GMT)
29.31N 53.07E Sat 20:08:11 GMT 2.5 5km
31.45N 57.13E Sat 23:47:59 GMT 2.6 8km
27.879 56.702 Sun 04:53:37 GMT 4.4 10km
27.800 56.790 Sun 05:05:19 GMT 3.0 10km
36.740 49.790 Sun 06:15:40 GMT 3.7 8km
32.23N 56.09E Sun 06:51:19 GMT 2.5 9km

Saturday was oddly quiet for Iran in terms of recorded earthquakes. Hmmmm.....

For reference
Fordo: 34.2605° N, 50.9042° E
Natanz: 33.5074, 51.9137
Isfahan: 32.6539° N, 51.6660° E

Relevant article: Identifying attacks in the Russia–Ukraine conflict using seismic array data

(Trump said more than just that the attack was a "big success". He said
"Tonight, I can report to the world that the strikes were a spectacular military success. Iran’s key nuclear enrichment facilities have been completely and totally obliterated."
I doubt he has the information to make such a claim.)

[M T]

I checked USGS’s earthquakes bigger than 2.5 an hour or two after the announcement and none were registered in Iran.

Quite possibly, the earthquake monitors are filtering out near-surface activity.

I’ve seen 1+ magnitude (depth of 0km) earthquakes registered in Santa Clara county mining ops clearly from man-made blasts. So I expected to see these bunker busters. 

I haven't seen a firm time of the bombing (I guess no one got invited to Signal!). Trump posted his announcement at 7:46 EDT (Sat 23:46 UTC).

Looking at a list of earthquakes in the vicinity of Iran (> 1, apparently)
lat/long day GMT Mag depth
(no earlier quakes on Sat GMT)
29.31N 53.07E Sat 20:08:11 GMT 2.5 5km
31.45N 57.13E Sat 23:47:59 GMT 2.6 8km
27.879 56.702 Sun 04:53:37 GMT 4.4 10km
27.800 56.790 Sun 05:05:19 GMT 3.0 10km
36.740 49.790 Sun 06:15:40 GMT 3.7 8km
32.23N 56.09E Sun 06:51:19 GMT 2.5 9km

Saturday was oddly quiet for Iran in terms of recorded earthquakes. Hmmmm.....

For reference
Fordo: 34.2605° N, 50.9042° E
Natanz: 33.5074, 51.9137
Isfahan: 32.6539° N, 51.6660° E

Relevant article: Identifying attacks in the Russia–Ukraine conflict using seismic array data

(Trump said more than just that the attack was a "big success". He said
"Tonight, I can report to the world that the strikes were a spectacular military success. Iran’s key nuclear enrichment facilities have been completely and totally obliterated."
I doubt he has the information to make such a claim.)