Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 11-04-2021 and time 23:12:06 (UTC) in region 2 km E Massa Martana (PG)

A magnitude ML 1.9 earthquake occured in region: 2 km E Massa Martana (PG), on

  • 11-04-2021 23:12:06 (UTC)
  • 12-04-2021 01:12:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7850, 12.5520 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
Massa Martana PG 3 3770 3770
Giano dell'Umbria PG 6 3846 7616
Acquasparta TR 10 4778 12394
Castel Ritaldi PG 11 3278 15672
Todi PG 12 16851 32523
Gualdo Cattaneo PG 14 6155 38678
Montefalco PG 15 5679 44357
Collazzone PG 15 3473 47830
Montecastrilli TR 16 5022 52852
Spoleto PG 16 38218 91070
Fratta Todina PG 17 1839 92909
Bevagna PG 17 5081 97990
Monte Castello di Vibio PG 17 1567 99557
Avigliano Umbro TR 18 2558 102115
Campello sul Clitunno PG 19 2442 104557
San Gemini TR 19 5018 109575
Trevi PG 19 8469 118044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
26 Km NW of Terni (111501 inhabitants)
38 Km SE of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
84 Km NW of L'Aquila (69753 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
95 Km W of Teramo (54892 inhabitants)
99 Km NE of Civitavecchia (52991 inhabitants)
99 Km N of Roma (2864731 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 1.9 2021-04-11
23:12:06		 42.785 12.5523 8 2021-07-12
16:55:14		 Bollettino Sismico Italiano INGV 91051061
Reviewed
Rev100 		ML 1.9 2021-04-11
23:12:06		 42.785 12.5567 8 2021-04-11
23:20:29		 Sala Sismica INGV-Roma 89022951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-11 23:12:06 ± 0.05
Latitude 42.7850 ± 0.0027
Longitude 12.5523 ± 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 91051061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 53
Number of defining phases 51
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78871
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 61
Type of magnitude ML
Reference to an origin 91051061
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-10 18:19:30

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 89022951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-11 23:20:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2021-04-11T23:13:09.97 3.0 undecidable manual Sg 2.96 0
IV.TERO.HHZ. 2021-04-11T23:12:33.36 0.3 undecidable manual S 101 87.5457 50 0.37 61
IV.CAFI.HHZ. 2021-04-11T23:12:30.60 0.3 undecidable manual S 322 76.8675 50 0.49 61
IV.FIAM.HHZ. 2021-04-11T23:12:29.44 0.6 undecidable manual S 141 73.6707 50 0.17 44
IV.MMO1.EHZ. 2021-04-11T23:12:27.28 0.3 undecidable manual S 78 64.2912 50 0.52 62
IV.CSP1.EHZ. 2021-04-11T23:12:26.78 0.3 undecidable manual S 57 62.9925 50 0.36 64
IV.ATMI.HHZ. 2021-04-11T23:12:26.54 0.3 undecidable manual S 339 65.1903 50 -0.46 63
IV.RM33.EHZ. 2021-04-11T23:12:26.47 0.6 undecidable manual S 119 62.0934 50 0.28 44
IV.SRES.HHZ. 2021-04-11T23:12:26.37 0.6 undecidable manual S 183 60.8946 50 0.5 42
IV.FOSV.EHZ. 2021-04-11T23:12:25.72 0.3 undecidable manual S 17 58.9965 50 0.35 65
IV.MURB.HHZ. 2021-04-11T23:12:24.24 0.6 undecidable manual S 358 53.1024 50 0.47 43
IV.SACS.HHZ. 2021-04-11T23:12:24.23 0.6 undecidable manual S 278 52.8027 50 0.53 42
IV.FDMO.HHZ. 2021-04-11T23:12:23.25 0.3 undecidable manual S 57 51.6039 50 -0.14 69
IV.MNTT.EHZ. 2021-04-11T23:12:23.34 3.0 undecidable manual P 0
IV.TERO.HHZ. 2021-04-11T23:12:21.42 0.3 undecidable manual P 101 87.5457 50 -0.37 61
IV.ATCC.EHZ. 2021-04-11T23:12:21.35 0.6 undecidable manual S 9 44.9217 50 -0.26 45
IV.PIEI.HHZ. 2021-04-11T23:12:21.15 0.6 undecidable manual P 359 83.25 50 0.02 44
IV.NRCA.HHZ. 2021-04-11T23:12:21.87 0.3 undecidable manual S 83 46.0206 50 -0.03 71
IV.LNSS.HHZ. 2021-04-11T23:12:21.24 0.3 undecidable manual S 117 44.622 50 -0.28 68
IV.CAFI.HHZ. 2021-04-11T23:12:20.08 0.1 undecidable manual P 322 76.8675 50 -0.05 89
IV.MF5.EHZ. 2021-04-11T23:12:20.63 0.1 undecidable manual P 73 77.0673 50 0.46 82
IV.CESI.HHZ. 2021-04-11T23:12:19.35 0.1 undecidable manual S 49 37.629 50 -0.3 91
IV.MGAB.HHZ. 2021-04-11T23:12:19.76 0.3 undecidable manual S 292 38.5281 50 -0.13 71
IV.FIAM.HHZ. 2021-04-11T23:12:19.41 0.3 undecidable manual P 141 73.6707 50 -0.23 65
IV.SMA1.EHZ. 2021-04-11T23:12:18.38 0.1 positive manual P 105 66.0894 50 -0.09 90
IV.ATMI.HHZ. 2021-04-11T23:12:18.36 0.3 undecidable manual P 339 65.1903 50 0.03 68
IV.MMO1.EHZ. 2021-04-11T23:12:18.05 0.1 positive manual P 78 64.2912 50 -0.14 89
IV.RM33.EHZ. 2021-04-11T23:12:17.57 0.1 positive manual P 119 62.0934 50 -0.29 87
IV.ASSB.HHZ. 2021-04-11T23:12:17.04 0.3 undecidable manual S 17 29.8479 105 -0.18 71
IV.SRES.HHZ. 2021-04-11T23:12:17.70 0.6 undecidable manual P 183 60.8946 50 0.03 46
IV.CSP1.EHZ. 2021-04-11T23:12:17.84 0.3 undecidable manual P 57 62.9925 50 -0.15 67
IV.GAVE.EHZ. 2021-04-11T23:12:17.53 0.3 undecidable manual S 110 29.6481 105 0.37 68
IV.FOSV.EHZ. 2021-04-11T23:12:17.33 0.1 undecidable manual P 17 58.9965 50 -0.06 92
IV.FDMO.HHZ. 2021-04-11T23:12:16.03 0.1 positive manual P 57 51.6039 50 -0.22 90
IV.SACS.HHZ. 2021-04-11T23:12:16.39 0.1 positive manual P 278 52.8027 50 -0.03 93
IV.MURB.HHZ. 2021-04-11T23:12:16.48 0.3 undecidable manual P 358 53.1024 50 0.01 70
IV.ARRO.EHZ. 2021-04-11T23:12:16.85 0.3 undecidable manual S 143 28.749 106 0.02 73
IT.FOPC.HGZ. 2021-04-11T23:12:15.55 0.1 undecidable manual S 31 23.8539 109 0.32 93
IV.ATCC.EHZ. 2021-04-11T23:12:15.16 0.1 undecidable manual P 9 44.9217 50 -0.06 94
IV.NRCA.HHZ. 2021-04-11T23:12:15.15 0.1 positive manual P 83 46.0206 50 -0.24 91
IV.MGAB.HHZ. 2021-04-11T23:12:14.05 0.1 positive manual P 292 38.5281 50 -0.17 93
IV.LNSS.HHZ. 2021-04-11T23:12:14.84 0.1 positive manual P 117 44.622 50 -0.32 89
IV.CESX.HHZ. 2021-04-11T23:12:13.93 0.3 undecidable manual S 172 19.7691 112 0.03 74
IV.CESI.HHZ. 2021-04-11T23:12:13.93 0.1 undecidable manual P 49 37.629 50 -0.16 94
IV.GAVE.EHZ. 2021-04-11T23:12:12.40 0.1 positive manual P 110 29.6481 105 -0.25 93
IV.ARRO.EHZ. 2021-04-11T23:12:12.51 0.1 undecidable manual P 143 28.749 106 0.05 97
IV.ASSB.HHZ. 2021-04-11T23:12:12.62 0.1 undecidable manual P 17 29.8479 105 -0.06 97
IT.FOPC.HGZ. 2021-04-11T23:12:11.73 0.1 undecidable manual P 31 23.8539 109 0.19 95
IV.CESX.HHZ. 2021-04-11T23:12:10.84 0.1 positive manual P 172 19.7691 112 0.08 98
IV.MOMA.HHZ. 2021-04-11T23:12:09.29 0.1 undecidable manual S 35 2.4975 163 -0.13 100
IT.GNU.HGZ. 2021-04-11T23:12:09.20 0.1 undecidable manual S 35 2.4975 163 -0.22 98
IV.MOMA.HHZ. 2021-04-11T23:12:08.40 0.1 undecidable manual P 35 2.4975 163 0.22 98
IT.GNU.HGZ. 2021-04-11T23:12:08.40 0.1 negative manual P 35 2.4975 163 0.22 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:0.0 0.0092140265 0.192 AML other m 2021-04-11T23:12:10.69
IV.MOMA.HHE. ML:0.0 0.01689288 0.1408 AML other m 2021-04-11T23:12:09.88
IV.MOMA.HNE. ML:0.0 0.015460114999999998 0.128 AML other m 2021-04-11T23:12:09.88
IV.MOMA.HHN. ML:0.0 0.009892023 0.2048 AML other m 2021-04-11T23:12:10.68
IV.CESX.HHN. ML:1.8 0.00055780385 0.2176 AML other m 2021-04-11T23:12:14.20
IV.CESX.HHE. ML:2.0 0.000807 0.52 AML other m 2021-04-11T23:12:15.65
IV.ASSB.HHE. ML:1.6 0.00020618130000000002 0.1024 AML other m 2021-04-11T23:12:17.92
IV.ARRO.EHE. ML:1.8 0.00032499999999999993 0.18 AML other m 2021-04-11T23:12:17.60
IV.GAVE.EHE. ML:2.2 0.0008560000000000001 0.14 AML other m 2021-04-11T23:12:17.80
IV.GAVE.EHN. ML:2.0 0.00057336785 0.2048 AML other m 2021-04-11T23:12:17.80
IV.ARRO.EHN. ML:1.8 0.0003492501 0.2176 AML other m 2021-04-11T23:12:19.62
IV.ASSB.HHN. ML:1.7 0.00025171855 0.1536 AML other m 2021-04-11T23:12:17.64
IV.CESI.HHE. ML:1.7 0.0001861718 0.1408 AML other m 2021-04-11T23:12:21.18
IV.MGAB.HHE. ML:1.9 0.00027088219999999997 0.192 AML other m 2021-04-11T23:12:21.50
IV.MGAB.HNE. ML:1.8 0.00024256775 0.1792 AML other m 2021-04-11T23:12:21.50
IV.CESI.HHN. ML:1.9 0.00028394285 0.1664 AML other m 2021-04-11T23:12:20.92
IV.MGAB.HNN. ML:1.8 0.0002490122 0.256 AML other m 2021-04-11T23:12:20.61
IV.MGAB.HHN. ML:1.8 0.0002519086 0.1152 AML other m 2021-04-11T23:12:20.61
IV.LNSS.HHN. ML:2.2 0.00042707304999999994 0.2048 AML other m 2021-04-11T23:12:22.68
IV.LNSS.HHE. ML:2.3 0.00055724995 0.2176 AML other m 2021-04-11T23:12:23.64
IV.NRCA.HHN. ML:2.2 0.000493 0.12 AML other m 2021-04-11T23:12:23.63
IV.FDMO.HHE. ML:1.9 0.00019252705 0.192 AML other m 2021-04-11T23:12:24.12
IV.ATCC.EHE. ML:1.7 0.00016147400000000002 0.1792 AML other m 2021-04-11T23:12:24.08
IV.NRCA.HHE. ML:2.2 0.00043149999999999997 0.12 AML other m 2021-04-11T23:12:24.51
IV.FDMO.HHN. ML:1.7 0.00012614219500000002 0.1408 AML other m 2021-04-11T23:12:24.77
IV.SACS.HHN. ML:1.4 0.00005564688500000001 0.256 AML other m 2021-04-11T23:12:27.11
IV.MURB.HNN. ML:2.3 0.0004525 1.74 AML other m 2021-04-11T23:12:27.00
IV.MURB.HHN. ML:2.3 0.000442 0.3 AML other m 2021-04-11T23:12:27.16
IV.ATCC.EHN. ML:1.6 0.0001305 0.68 AML other m 2021-04-11T23:12:27.03
IV.CSP1.EHN. ML:2.2 0.00033800000000000003 1.72 AML other m 2021-04-11T23:12:27.98
IV.MURB.HNE. ML:2.3 0.00045231285 0.256 AML other m 2021-04-11T23:12:27.19
IV.MURB.HHE. ML:2.3 0.000478 0.24 AML other m 2021-04-11T23:12:27.20
IV.CSP1.EHE. ML:2.4 0.0004435 0.16 AML other m 2021-04-11T23:12:27.27
IV.SACS.HHE. ML:1.4 0.00005689037 0.2304 AML other m 2021-04-11T23:12:28.34
IV.FOSV.EHE. ML:1.5 0.00006814999999999999 0.3 AML other m 2021-04-11T23:12:28.47
IV.RM33.EHE. ML:2.0 0.0001750766 0.2816 AML other m 2021-04-11T23:12:28.58
IV.RM33.EHN. ML:1.9 0.0001585 1.78 AML other m 2021-04-11T23:12:29.95
IV.SMA1.EHN. ML:2.2 0.0002845 0.28 AML other m 2021-04-11T23:12:29.40
IV.SMA1.EHE. ML:2.3 0.00036050000000000003 0.2 AML other m 2021-04-11T23:12:29.62
IV.FOSV.EHN. ML:1.4 0.00005876 0.256 AML other m 2021-04-11T23:12:30.12
IV.FIAM.HHE. ML:1.3 0.000028874485 0.3072 AML other m 2021-04-11T23:12:30.59
IV.CAFI.HHE. ML:1.5 0.00004795 0.58 AML other m 2021-04-11T23:12:31.11
IV.CAFI.HHN. ML:1.4 0.00004045 1.32 AML other m 2021-04-11T23:12:33.22
IV.ATMI.HHE. ML:2.2 0.000264 0.32 AML other m 2021-04-11T23:12:33.74
IV.ATMI.HHN. ML:2.2 0.000316 0.34 AML other m 2021-04-11T23:12:33.70
IV.PIEI.HHE. ML:1.6 0.00005025 0.32 AML other m 2021-04-11T23:12:35.35
IV.FIAM.HHN. ML:1.5 0.000043049999999999996 0.32 AML other m 2021-04-11T23:12:35.79
IV.TERO.HHE. ML:1.6 0.000044507545 0.1152 AML other m 2021-04-11T23:12:35.12
IV.PIEI.HHN. ML:1.5 0.000039349999999999994 0.28 AML other m 2021-04-11T23:12:37.39
IV.TERO.HHN. ML:1.7 0.000055458720000000006 0.3584 AML other m 2021-04-11T23:12:38.32
IV.GAVE.HNN. ML:1.6 0.00018684935 0.2048 AML other m 2021-04-11T23:12:17.80
IV.GAVE.HNE. ML:2.2 0.0008044609 0.1408 AML other m 2021-04-11T23:12:17.79
IV.CESI.HNN. ML:2.5 0.001219277 0.3712 AML other m 2021-04-11T23:12:20.93
IV.CESI.HNE. ML:1.7 0.00018177369999999998 0.192 AML other m 2021-04-11T23:12:20.53
IV.LNSS.HNN. ML:2.1 0.00036928344999999997 0.1664 AML other m 2021-04-11T23:12:23.41
IV.LNSS.HNE. ML:2.2 0.00052722035 0.2048 AML other m 2021-04-11T23:12:23.64
IV.NRCA.HNE. ML:2.2 0.0004075065 0.1152 AML other m 2021-04-11T23:12:24.45
IV.NRCA.HNN. ML:2.2 0.00043299605 0.0896 AML other m 2021-04-11T23:12:23.58
IV.SACS.HNE. ML:1.8 0.00016326815 0.9216 AML other m 2021-04-11T23:12:25.54
IV.SACS.HNN. ML:1.8 0.00015828600000000002 0.4352 AML other m 2021-04-11T23:12:26.39
IV.FIAM.HNN. ML:2.0 0.00015855724999999998 0.5888 AML other m 2021-04-11T23:12:43.83
IV.CAFI.HNN. ML:2.0 0.00014133259999999997 0.6272 AML other m 2021-04-11T23:12:35.87
IV.CAFI.HNE. ML:1.8 0.000104425015 0.6016 AML other m 2021-04-11T23:12:44.54
IV.TERO.HNN. ML:2.1 0.000167405795 1.1136 AML other m 2021-04-11T23:12:44.56
IV.TERO.HNE. ML:2.0 0.00011100954999999998 0.768 AML other m 2021-04-11T23:12:39.78
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