Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-03-2021 and time 05:45:16 (Italy) in region 3 km SW Valfabbrica (PG)

A magnitude ML 1.2 earthquake occured in region: 3 km SW Valfabbrica (PG), on

  • 21-03-2021 04:45:16 (UTC)
  • 21-03-2021 05:45:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1430, 12.5710 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Valfabbrica PG 3 3389 3389
Bastia Umbra PG 9 21874 25263
Assisi PG 9 28299 53562
Perugia PG 15 166134 219696
Bettona PG 16 4367 224063
Cannara PG 16 4305 228368
Torgiano PG 17 6725 235093
Valtopina PG 18 1398 236491
Nocera Umbra PG 18 5839 242330
Spello PG 19 8645 250975

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km E of Perugia (166134 inhabitants)
23 Km NW of Foligno (57155 inhabitants)
65 Km N of Terni (111501 inhabitants)
66 Km SE of Arezzo (99543 inhabitants)
86 Km SW of Fano (60888 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
90 Km SW of Pesaro (94582 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.2 2021-03-21
04:45:16		 43.1427 12.5708 8 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88383321
Reviewed
Rev100 		ML 1.5 2021-03-21
04:45:16		 43.1333 12.5727 8 2021-03-21
04:57:00		 Sala Sismica INGV-Roma 88335981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 04:45:16 ± 0.06
Latitude 43.1427 ± 0.0027
Longitude 12.5708 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88383321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 348
Semi-minor axis of confidence ellipse (meter) 116
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 219
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
Number of associated phases, regardless of their use for origin computation 50
Number of defining phases 50
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.06565
Epicentral distance of station farthest from the epicenter (degree) 0.47754
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 88335981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-21 04:57:00

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 88383321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 12:24:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2021-03-21T04:45:33.50 0.3 undecidable manual S 293 53.0025 50 0.09 69
IV.BADI.EHE. 2021-03-21T04:45:32.26 0.1 undecidable manual S 327 48.5181 50 0.07 93
IV.ARVD.HHE. 2021-03-21T04:45:32.95 0.1 undecidable manual S 37 49.5171 50 0.49 85
IV.EL6.EHZ. 2021-03-21T04:45:32.53 0.3 undecidable manual S 64 47.619 50 0.56 62
IV.MGAB.HHZ. 2021-03-21T04:45:31.62 0.3 undecidable manual S 236 45.1215 50 0.33 67
IV.ATPC.HHE. 2021-03-21T04:45:30.00 0.1 undecidable manual S 346 38.628 50 0.44 88
IV.FRON.EHZ. 2021-03-21T04:45:30.64 0.1 undecidable manual S 17 43.4232 50 -0.21 92
IV.SSFR.HHN. 2021-03-21T04:45:29.02 0.1 undecidable manual S 28 36.741 50 -0.05 96
IV.ATPI.EHE. 2021-03-21T04:45:29.03 0.1 undecidable manual S 338 36.741 50 -0.04 96
IV.ATBU.EHZ. 2021-03-21T04:45:29.06 0.1 undecidable manual S 357 37.0296 50 -0.06 95
IV.SNTG.HHE. 2021-03-21T04:45:28.03 0.1 undecidable manual S 67 32.4453 104 0.31 91
IV.ATMI.HHZ. 2021-03-21T04:45:28.14 0.1 undecidable manual S 311 32.4453 104 0.41 89
IV.ATSC.EHE. 2021-03-21T04:45:27.67 0.1 undecidable manual S 17 32.5452 104 -0.11 95
IV.TB03.DHZ.01 2021-03-21T04:45:27.40 0.1 undecidable manual S 336 31.4463 104 -0.02 97
IV.MML1.HNE. 2021-03-21T04:45:27.76 0.6 undecidable manual S 96 32.6451 104 -0.04 48
IV.CAFI.HHZ. 2021-03-21T04:45:26.88 0.3 undecidable manual P 293 53.0025 50 0.77 57
IV.CESI.HHZ. 2021-03-21T04:45:26.89 0.1 undecidable manual S 119 31.0467 105 -0.39 90
IV.TB01.DHZ.01 2021-03-21T04:45:26.47 0.1 undecidable manual S 338 28.6491 106 0 98
IV.TB02.DHZ.01 2021-03-21T04:45:26.30 0.1 undecidable manual S 333 28.4493 106 -0.09 96
IV.EL6.EHZ. 2021-03-21T04:45:25.06 0.1 undecidable manual P 64 47.619 50 -0.22 91
IV.FOSV.EHZ. 2021-03-21T04:45:25.00 0.6 undecidable manual S 42 22.8549 110 0.45 45
IV.ATVA.EHZ. 2021-03-21T04:45:25.55 0.6 undecidable manual S 303 27.5502 106 -0.56 43
IV.BADI.EHE. 2021-03-21T04:45:25.10 0.1 undecidable manual P 327 48.5181 50 -0.31 89
IV.ARVD.HHE. 2021-03-21T04:45:25.17 0.1 undecidable manual P 37 49.5171 50 -0.39 87
IV.FRON.EHZ. 2021-03-21T04:45:24.43 0.1 undecidable manual P 17 43.4232 50 -0.2 92
IV.MGAB.HHZ. 2021-03-21T04:45:24.98 0.1 undecidable manual P 236 45.1215 50 0.1 93
IV.ATLO.EHZ. 2021-03-21T04:45:24.60 0.6 undecidable manual S 325 23.2545 109 -0.08 49
IV.ATPC.HHE. 2021-03-21T04:45:24.00 0.1 undecidable manual P 346 38.628 50 0.12 94
IT.FOPC.HGZ. 2021-03-21T04:45:24.48 0.6 undecidable manual S 151 21.9669 110 0.22 47
IV.ATBU.EHZ. 2021-03-21T04:45:23.31 0.1 undecidable manual P 357 37.0296 50 -0.32 90
IV.ATSC.EHE. 2021-03-21T04:45:23.14 0.1 undecidable manual P 17 32.5452 104 0.28 92
IV.SSFR.HHN. 2021-03-21T04:45:23.15 0.1 undecidable manual P 28 36.741 50 -0.45 88
IV.ATPI.EHE. 2021-03-21T04:45:23.35 0.1 undecidable manual P 338 36.741 50 -0.25 92
IV.ATMI.HHZ. 2021-03-21T04:45:23.15 0.1 undecidable manual P 311 32.4453 104 0.32 91
IV.SNTG.HHE. 2021-03-21T04:45:22.79 0.1 undecidable manual P 67 32.4453 104 -0.04 97
IV.CESI.HHZ. 2021-03-21T04:45:22.59 0.1 undecidable manual P 119 31.0467 105 0.02 97
IV.TB03.DHZ.01 2021-03-21T04:45:22.30 0.1 undecidable manual P 336 31.4463 104 -0.35 91
IV.MURB.HHZ. 2021-03-21T04:45:22.03 0.6 undecidable manual S 344 13.875 120 0.32 47
IV.MML1.HNE. 2021-03-21T04:45:22.61 0.1 undecidable manual P 96 32.6451 104 -0.26 92
IV.TB01.DHZ.01 2021-03-21T04:45:21.73 0.1 undecidable manual P 338 28.6491 106 -0.37 91
IV.TB02.DHZ.01 2021-03-21T04:45:21.83 0.1 undecidable manual P 333 28.4493 106 -0.23 94
IV.FOSV.EHZ. 2021-03-21T04:45:21.06 0.1 undecidable manual P 42 22.8549 110 0.07 98
IV.ASSB.HHZ. 2021-03-21T04:45:21.59 0.6 undecidable manual S 147 13.1757 122 0.08 50
IV.ATVA.EHZ. 2021-03-21T04:45:21.73 0.3 undecidable manual P 303 27.5502 106 -0.16 71
IV.ATCC.EHZ. 2021-03-21T04:45:20.14 0.3 undecidable manual S 50 7.2927 138 0.22 73
IT.FOPC.HGZ. 2021-03-21T04:45:20.85 0.3 undecidable manual P 151 21.9669 110 0.02 74
IV.ATLO.EHZ. 2021-03-21T04:45:20.92 0.1 undecidable manual P 325 23.2545 109 -0.15 96
IV.ASSB.HHZ. 2021-03-21T04:45:19.27 0.1 undecidable manual P 147 13.1757 122 0.03 100
IV.MURB.HHZ. 2021-03-21T04:45:19.57 0.1 undecidable manual P 344 13.875 120 0.22 96
IV.ATCC.EHZ. 2021-03-21T04:45:18.51 0.1 undecidable manual P 50 7.2927 138 0.19 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHN. ML:1.5 0.0006054999999999999 0.32 AML other m 2021-03-21T04:45:20.67
IV.ATCC.EHE. ML:1.6 0.0006730000000000001 0.98 AML other m 2021-03-21T04:45:21.77
IV.ASSB.HHN. ML:1.2 0.0001705 0.2 AML other m 2021-03-21T04:45:21.57
IV.ASSB.HHE. ML:1.2 0.0001585 0.18 AML other m 2021-03-21T04:45:21.90
IV.MURB.HHE. ML:1.8 0.0006815 0.3 AML other m 2021-03-21T04:45:22.53
IV.MURB.HHN. ML:1.7 0.000557 1.02 AML other m 2021-03-21T04:45:23.47
IV.FOSV.EHE. ML:0.6 0.0000316847635 0.1792 AML other m 2021-03-21T04:45:26.42
IV.FOSV.EHN. ML:0.7 0.000036024535 0.3584 AML other m 2021-03-21T04:45:27.78
IV.CAFI.HHE. ML:0.6 0.000011181509000000001 0.2592 AML other m 2021-03-21T04:45:34.91
IV.CAFI.HHN. ML:0.6 0.000008314637 0.2592 AML other m 2021-03-21T04:45:37.54
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download