Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 21-03-2021 and time 08:23:31 (UTC) in region 4 km S Montefalco (PG)

A magnitude ML 1.5 earthquake occured in region: 4 km S Montefalco (PG), on

  • 21-03-2021 08:23:31 (UTC)
  • 21-03-2021 09:23:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8610, 12.6530 at 9 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montefalco PG 4 5679 5679
Castel Ritaldi PG 4 3278 8957
Giano dell'Umbria PG 7 3846 12803
Trevi PG 8 8469 21272
Bevagna PG 9 5081 26353
Gualdo Cattaneo PG 10 6155 32508
Campello sul Clitunno PG 11 2442 34950
Foligno PG 12 57155 92105
Massa Martana PG 14 3770 95875
Spello PG 15 8645 104520
Spoleto PG 16 38218 142738
Cannara PG 16 4305 147043
Collazzone PG 18 3473 150516
Vallo di Nera PG 20 364 150880

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km SW of Foligno (57155 inhabitants)
33 Km N of Terni (111501 inhabitants)
35 Km SE of Perugia (166134 inhabitants)
67 Km NE of Viterbo (67173 inhabitants)
83 Km NW of L'Aquila (69753 inhabitants)
89 Km W of Teramo (54892 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
96 Km N of Guidonia Montecelio (88673 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 1.5 2021-03-21
08:23:31		 42.8608 12.6527 9 2021-07-12
16:55:04		 Bollettino Sismico Italiano INGV 88742241
Reviewed
Rev100 		ML 1.5 2021-03-21
08:23:31		 42.8612 12.6487 9 2021-03-21
08:30:41		 Sala Sismica INGV-Roma 88341211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 08:23:31 ± 0.04
Latitude 42.8608 ± 0.0027
Longitude 12.6527 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88742241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 270
Semi-minor axis of confidence ellipse (meter) 245
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 135
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 51
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57107
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 88341211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-21 08:30:41

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 88742241
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-03 15:05:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.TUE.HHZ. 2021-03-21T08:25:00.06 3.0 undecidable manual Sn 0.22 0
IV.ZEN8.EHZ. 2021-03-21T08:24:55.70 3.0 undecidable manual Sg 22.379999 0
IV.PTRJ.HNZ. 2021-03-21T08:24:45.55 3.0 undecidable manual Sg 16.25 0
CR.STON.BHZ. 2021-03-21T08:24:39.12 3.0 undecidable manual Pg 19.360001 0
IV.MTGR.HHZ. 2021-03-21T08:24:39.34 3.0 undecidable manual Pg 9.37 0
IV.IFOR.HHZ. 2021-03-21T08:24:35.40 3.0 undecidable manual Sg 3 0
IV.MSSA.HHZ. 2021-03-21T08:24:15.65 3.0 undecidable manual Sn -2.97 0
IV.POFI.HHZ. 2021-03-21T08:24:15.55 3.0 undecidable manual Sn 1.72 0
IV.LPEL.HHZ. 2021-03-21T08:24:14.71 3.0 undecidable manual Sn -1.35 0
ST.CARE.EHZ. 2021-03-21T08:24:09.57 3.0 undecidable manual Pn 0.64 0
IV.VVLD.HHZ. 2021-03-21T08:24:07.47 3.0 undecidable manual Sn -3.21 0
IV.MOCL.EHZ. 2021-03-21T08:23:59.09 3.0 undecidable manual Sn 0.66 0
IV.PAOL.HHZ. 2021-03-21T08:23:56.02 3.0 negative manual Pn -3.69 0
IV.PTRJ.HNZ. 2021-03-21T08:23:56.24 3.0 undecidable manual Pn -0.37 0
IV.ATVA.EHE. 2021-03-21T08:23:49.33 0.1 undecidable manual S 327 55.1004 50 -0.12 92
IV.CSP1.EHZ. 2021-03-21T08:23:48.79 0.6 undecidable manual S 60 51.6039 50 0.27 45
IV.MURB.HHE. 2021-03-21T08:23:47.35 0.3 undecidable manual S 347 45.8208 50 0.38 66
IV.MC2.EHZ. 2021-03-21T08:23:46.87 0.3 undecidable manual S 82 43.9227 50 0.4 66
IV.MGAB.HNN. 2021-03-21T08:23:46.80 0.6 undecidable manual S 278 44.3223 50 0.23 46
IV.NRCA.HNZ. 2021-03-21T08:23:44.88 0.6 undecidable manual S 94 37.629 50 0.09 48
IV.MML1.HNE. 2021-03-21T08:23:44.77 0.1 undecidable manual S 43 38.1285 50 -0.16 94
IV.EL6.EHZ. 2021-03-21T08:23:43.18 0.3 undecidable manual P 35 63.3921 50 -0.09 68
IV.ARRO.EHN. 2021-03-21T08:23:43.59 0.6 undecidable manual S 164 32.5452 50 0.15 47
IV.ATCC.HNZ. 2021-03-21T08:23:43.95 0.6 undecidable manual S 358 36.0417 50 -0.4 45
IV.ATVA.EHE. 2021-03-21T08:23:42.40 0.1 undecidable manual P 327 55.1004 50 0.42 86
IV.CESX.HHN. 2021-03-21T08:23:41.71 0.6 undecidable manual S 191 28.5492 107 -0.41 45
IV.CSP1.EHZ. 2021-03-21T08:23:41.32 0.3 undecidable manual P 60 51.6039 50 -0.12 69
IV.CESI.HHZ. 2021-03-21T08:23:41.36 0.6 undecidable manual S 52 25.9518 109 0.08 49
IV.GAVE.EHZ. 2021-03-21T08:23:41.81 0.6 undecidable manual S 133 27.1506 108 0.14 48
IV.MURB.HHE. 2021-03-21T08:23:40.53 0.1 undecidable manual P 347 45.8208 50 -0.02 95
IV.MC2.EHZ. 2021-03-21T08:23:40.17 0.3 undecidable manual P 82 43.9227 50 -0.09 70
IV.MGAB.HNN. 2021-03-21T08:23:40.32 0.3 undecidable manual P 278 44.3223 50 0 72
IV.ASSB.HHZ. 2021-03-21T08:23:39.15 0.6 undecidable manual S 1 20.1687 114 -0.26 47
IV.MML1.HNE. 2021-03-21T08:23:39.09 0.1 undecidable manual P 43 38.1285 50 -0.28 91
IV.ATCC.HNZ. 2021-03-21T08:23:38.69 0.1 undecidable manual P 358 36.0417 50 -0.35 90
IV.RIBO.EHZ.01 2021-03-21T08:23:38.59 3.0 undecidable manual Sg -9.99 0
IV.NRCA.HNZ. 2021-03-21T08:23:38.98 0.3 undecidable manual P 94 37.629 50 -0.31 68
IT.FIE.HGZ. 2021-03-21T08:23:38.27 3.0 undecidable manual P 1.01 0
IV.ARRO.EHN. 2021-03-21T08:23:38.66 0.3 undecidable manual P 164 32.5452 50 0.15 71
IT.FOPC.HGE. 2021-03-21T08:23:37.30 0.3 undecidable manual S 19 12.7761 125 0.16 73
IV.GAVE.EHZ. 2021-03-21T08:23:37.47 0.3 undecidable manual P 133 27.1506 108 -0.02 74
IV.CESX.HHN. 2021-03-21T08:23:37.60 0.3 undecidable manual P 191 28.5492 107 -0.15 72
IV.CESI.HHZ. 2021-03-21T08:23:37.26 0.1 undecidable manual P 52 25.9518 109 0 99
IV.ASSB.HHZ. 2021-03-21T08:23:36.18 0.3 undecidable manual P 1 20.1687 114 0 75
IT.GNU.HGE. 2021-03-21T08:23:36.24 0.6 undecidable manual S 227 9.1797 134 0.05 50
IT.FOPC.HGE. 2021-03-21T08:23:35.07 0.1 undecidable manual P 19 12.7761 125 0.19 97
IV.MOMA.HHZ. 2021-03-21T08:23:35.98 0.6 undecidable manual S 227 9.1797 134 -0.21 49
IT.GNU.HGE. 2021-03-21T08:23:34.47 0.1 undecidable manual P 227 9.1797 134 0.14 99
IV.MOMA.HHZ. 2021-03-21T08:23:34.41 0.1 undecidable manual P 227 9.1797 134 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.5 0.0005415000000000001 0.22 AML other m 2021-03-21T08:23:36.78
IV.MOMA.HHE. ML:1.5 0.0005344999999999999 0.22 AML other m 2021-03-21T08:23:36.78
IV.MOMA.HNE. ML:1.5 0.00053 0.24 AML other m 2021-03-21T08:23:36.78
IV.MOMA.HNN. ML:1.6 0.0005615 1.3 AML other m 2021-03-21T08:23:36.90
IV.ASSB.HHE. ML:1.5 0.00022499999999999997 0.4 AML other m 2021-03-21T08:23:39.68
IV.ASSB.HHN. ML:1.4 0.00016999999999999999 0.42 AML other m 2021-03-21T08:23:40.56
IV.GAVE.EHN. ML:1.5 0.000178 0.2 AML other m 2021-03-21T08:23:42.57
IV.CESI.HHN. ML:0.9 0.00004606463 0.1216 AML other m 2021-03-21T08:23:42.75
IV.GAVE.HNE. ML:1.6 0.00019606305000000003 0.1728 AML other m 2021-03-21T08:23:43.37
IV.GAVE.EHE. ML:1.5 0.00019 0.42 AML other m 2021-03-21T08:23:43.28
IV.CESI.HHE. ML:0.9 0.00004695375 0.576 AML other m 2021-03-21T08:23:41.76
IV.CSP1.EHN. ML:2.0 0.00028697149999999997 3.2 AML other m 2021-03-21T08:23:49.95
IV.CSP1.EHE. ML:1.7 0.00012126265 3.0784 AML other m 2021-03-21T08:23:49.70
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