Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 21-03-2021 and time 22:25:57 (Italy) in region 6 km NW Massa Martana (PG)

A magnitude ML 2.2 earthquake occured in region: 6 km NW Massa Martana (PG), on

  • 21-03-2021 21:25:57 (UTC)
  • 21-03-2021 22:25:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8210, 12.4860 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 6 3770 3770
Giano dell'Umbria PG 8 3846 7616
Todi PG 8 16851 24467
Collazzone PG 9 3473 27940
Fratta Todina PG 11 1839 29779
Monte Castello di Vibio PG 11 1567 31346
Gualdo Cattaneo PG 12 6155 37501
Acquasparta TR 15 4778 42279
Castel Ritaldi PG 15 3278 45557
Marsciano PG 16 18902 64459
Montefalco PG 16 5679 70138
Bevagna PG 16 5081 75219
San Venanzo TR 19 2218 77437
Deruta PG 19 9669 87106
Montecastrilli TR 19 5022 92128
Avigliano Umbro TR 19 2558 94686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
32 Km NW of Terni (111501 inhabitants)
33 Km S of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
87 Km SE of Arezzo (99543 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 inhabitants)
99 Km NE of Civitavecchia (52991 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 2.2 2021-03-21
21:25:57		 42.8208 12.4863 8 2021-07-12
16:55:06		 Bollettino Sismico Italiano INGV 89121141
Reviewed
Rev100 		ML 2.1 2021-03-21
21:25:57		 42.8243 12.5043 9 2021-03-21
21:31:01		 Sala Sismica INGV-Roma 88359651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 21:25:57 ± 0.06
Latitude 42.8208 ± 0.0036
Longitude 12.4863 ± 0.0049
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 89121141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 352
Semi-minor axis of confidence ellipse (meter) 279
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 213
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) 65
Number of associated phases, regardless of their use for origin computation 60
Number of defining phases 57
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.84626
Number of stations at which the event was observed 37
Number of stations from which data was used for origin computation 34
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 89121141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-23 12:23:05

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 88359651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-21 21:31:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OT.OT14.EHZ. 2021-03-21T21:27:17.09 3.0 undecidable manual Sn 3.1 0
IV.SEI.HHZ. 2021-03-21T21:26:46.87 3.0 undecidable manual S 2.25 0
IV.FIR.HHZ. 2021-03-21T21:26:42.98 3.0 undecidable manual S 2.54 0
IV.MF5.EHZ. 2021-03-21T21:26:23.98 0.6 undecidable manual S 76 81.252 50 1.5 25
IV.GUMA.HHZ. 2021-03-21T21:26:21.30 0.6 undecidable manual S 68 73.9704 50 0.75 37
IV.EL6.EHZ. 2021-03-21T21:26:21.19 0.6 undecidable manual S 41 75.2691 50 0.29 43
IV.SMA1.EHZ. 2021-03-21T21:26:21.01 0.6 undecidable manual S 107 72.372 50 0.9 35
IV.MMO1.EHZ. 2021-03-21T21:26:19.53 0.6 undecidable manual S 82 68.8755 50 0.34 43
IV.RM33.EHZ. 2021-03-21T21:26:19.38 0.6 undecidable manual S 120 68.7756 50 0.24 44
IV.SRES.HHZ. 2021-03-21T21:26:18.43 0.6 undecidable manual S 178 64.7907 50 0.34 44
IV.CSP1.EHZ. 2021-03-21T21:26:18.51 0.3 undecidable manual S 62 65.5899 50 0.19 67
IV.MC2.EHZ. 2021-03-21T21:26:16.66 0.6 undecidable manual S 80 57.9975 50 0.37 44
IV.LNSS.HHZ. 2021-03-21T21:26:14.26 0.3 undecidable manual S 118 51.2154 50 -0.21 69
IV.MNTT.EHZ. 2021-03-21T21:26:14.82 0.6 undecidable manual P 73 93.9393 50 0.91 34
IV.MURB.HHZ. 2021-03-21T21:26:14.67 0.6 undecidable manual S 4 49.1175 50 0.75 39
IV.PARC.HHZ. 2021-03-21T21:26:14.18 0.3 undecidable manual P 348 93.9393 50 0.27 63
IV.NRCA.HHZ. 2021-03-21T21:26:14.32 0.6 undecidable manual S 88 51.1155 50 -0.12 47
IV.SSP9.EHZ. 2021-03-21T21:26:13.38 0.6 undecidable manual P 341 88.3449 50 0.35 42
IV.SACS.HHZ. 2021-03-21T21:26:13.73 0.6 undecidable manual S 274 47.0196 50 0.38 45
IV.TERO.HHZ. 2021-03-21T21:26:13.63 0.3 undecidable manual P 103 93.7395 50 -0.23 63
IV.NARO.HHZ. 2021-03-21T21:26:13.06 0.6 undecidable manual P 5 87.9453 50 0.08 44
IV.MF5.EHZ. 2021-03-21T21:26:12.24 0.3 undecidable manual P 76 81.252 50 0.3 64
IV.BADI.EHZ. 2021-03-21T21:26:11.94 0.3 undecidable manual P 346 78.8655 50 0.36 64
IV.BARO.HNZ. 2021-03-21T21:26:11.35 0.3 undecidable manual P 209 72.8715 50 0.7 57
IV.GUMA.HHZ. 2021-03-21T21:26:11.00 0.3 undecidable manual P 68 73.9704 50 0.18 67
IV.ATCC.EHZ. 2021-03-21T21:26:11.90 0.6 undecidable manual S 17 42.3243 50 -0.19 47
IV.SMA1.EHZ. 2021-03-21T21:26:10.54 0.1 undecidable manual P 107 72.372 50 -0.03 92
IV.CESI.HHZ. 2021-03-21T21:26:10.88 0.3 undecidable manual S 59 39.627 50 -0.5 66
IV.EL6.EHZ. 2021-03-21T21:26:10.75 0.3 undecidable manual P 41 75.2691 50 -0.28 65
IV.GAVE.EHZ. 2021-03-21T21:26:10.08 0.6 undecidable manual S 113 36.1416 102 -0.28 47
IV.CAFI.HHZ. 2021-03-21T21:26:10.11 0.1 undecidable manual P 323 70.374 50 -0.16 90
IV.RM33.EHZ. 2021-03-21T21:26:09.69 0.1 undecidable manual P 120 68.7756 50 -0.33 87
IV.CSP1.EHZ. 2021-03-21T21:26:09.37 0.1 undecidable manual P 62 65.5899 50 -0.17 90
IV.MGAB.HHZ. 2021-03-21T21:26:09.05 0.6 undecidable manual S 289 32.0457 103 0.07 49
IV.SRES.HHZ. 2021-03-21T21:26:09.01 0.3 undecidable manual P 178 64.7907 50 -0.4 65
IV.MMO1.EHZ. 2021-03-21T21:26:09.83 0.1 undecidable manual P 82 68.8755 50 -0.21 89
IV.ARRO.EHZ. 2021-03-21T21:26:09.77 0.3 undecidable manual S 140 35.1426 102 -0.25 70
IV.MC2.EHZ. 2021-03-21T21:26:08.17 0.1 undecidable manual P 80 57.9975 50 -0.19 91
IV.ATMI.HHZ. 2021-03-21T21:26:08.53 0.3 undecidable manual P 343 59.5959 50 -0.08 70
IV.ASSB.HHZ. 2021-03-21T21:26:07.39 0.3 undecidable manual S 30 28.3494 105 -0.32 70
IV.ATLO.EHE. 2021-03-21T21:26:07.50 0.3 undecidable manual P 353 55.2003 50 -0.43 65
IV.ATVA.EHE. 2021-03-21T21:26:07.29 0.1 undecidable manual P 342 53.3022 50 -0.35 89
IV.CESX.HHZ. 2021-03-21T21:26:06.60 0.3 undecidable manual S 161 24.9528 107 0.02 75
IV.SACS.HHZ. 2021-03-21T21:26:06.73 0.3 undecidable manual P 274 47.0196 50 0.06 72
IV.NRCA.HHZ. 2021-03-21T21:26:06.93 0.1 undecidable manual P 88 51.1155 50 -0.37 89
IT.FOPC.HGZ. 2021-03-21T21:26:06.47 0.6 undecidable manual S 47 24.1536 107 0.15 49
IV.LNSS.HHZ. 2021-03-21T21:26:06.88 0.1 undecidable manual P 118 51.2154 50 -0.44 88
IV.MURB.HHZ. 2021-03-21T21:26:06.80 0.1 undecidable manual P 4 49.1175 50 -0.2 93
IV.ATCC.EHZ. 2021-03-21T21:26:05.56 0.3 undecidable manual P 17 42.3243 50 -0.38 68
IV.CESI.HHZ. 2021-03-21T21:26:05.26 0.1 negative manual P 59 39.627 50 -0.28 93
IV.ARRO.EHZ. 2021-03-21T21:26:04.55 0.1 undecidable manual P 140 35.1426 102 -0.21 95
IV.GAVE.EHZ. 2021-03-21T21:26:04.66 0.3 undecidable manual P 113 36.1416 102 -0.29 70
IV.MGAB.HHZ. 2021-03-21T21:26:04.14 0.1 undecidable manual P 289 32.0457 103 -0.01 99
IV.ASSB.HHZ. 2021-03-21T21:26:03.37 0.1 positive manual P 30 28.3494 105 -0.05 99
IV.CESX.HHZ. 2021-03-21T21:26:02.80 0.1 positive manual P 161 24.9528 107 0.03 100
IT.FOPC.HGZ. 2021-03-21T21:26:02.77 0.1 undecidable manual P 47 24.1536 107 0.16 98
IV.MOMA.HNZ. 2021-03-21T21:26:01.28 0.3 undecidable manual S 105 7.0929 137 0.16 75
IT.GNU.HGZ. 2021-03-21T21:26:01.26 0.3 undecidable manual S 105 7.0929 137 0.13 76
IT.GNU.HGZ. 2021-03-21T21:25:59.98 0.1 undecidable manual P 105 7.0929 137 0.36 96
IV.MOMA.HNZ. 2021-03-21T21:25:59.97 0.1 undecidable manual P 105 7.0929 137 0.36 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HNN. ML:2.7 0.00929 0.22 AML other m 2021-03-21T21:26:01.50
IV.MOMA.HNE. ML:2.6 0.0073149999999999995 0.22 AML other m 2021-03-21T21:26:01.51
IV.MOMA.HHE. ML:2.7 0.00856 0.22 AML other m 2021-03-21T21:26:01.51
IV.MOMA.HHN. ML:2.7 0.010175 0.2 AML other m 2021-03-21T21:26:01.50
IV.CESX.HHN. ML:1.9 0.0005315 0.62 AML other m 2021-03-21T21:26:07.58
IV.ASSB.HHN. ML:2.2 0.0009205000000000001 0.34 AML other m 2021-03-21T21:26:07.80
IV.CESX.HHE. ML:2.0 0.000626 1.08 AML other m 2021-03-21T21:26:08.08
IV.ASSB.HHE. ML:2.0 0.0005705 0.64 AML other m 2021-03-21T21:26:09.60
IV.ARRO.EHE. ML:2.0 0.00044750000000000004 0.24 AML other m 2021-03-21T21:26:11.16
IV.MGAB.HHE. ML:1.9 0.00034550000000000005 0.44 AML other m 2021-03-21T21:26:11.04
IV.GAVE.EHN. ML:2.3 0.000878 0.68 AML other m 2021-03-21T21:26:11.83
IV.GAVE.EHE. ML:2.6 0.00147 0.16 AML other m 2021-03-21T21:26:11.52
IV.MGAB.HHN. ML:2.0 0.000516 0.18 AML other m 2021-03-21T21:26:11.81
IV.CESI.HHE. ML:2.0 0.00038500000000000003 1.76 AML other m 2021-03-21T21:26:11.06
IV.MGAB.HNE. ML:1.9 0.00037 0.44 AML other m 2021-03-21T21:26:11.98
IV.CESI.HHN. ML:2.2 0.0005495 0.3 AML other m 2021-03-21T21:26:12.41
IV.MGAB.HNN. ML:2.1 0.0006075000000000001 0.94 AML other m 2021-03-21T21:26:12.81
IV.ARRO.EHN. ML:2.0 0.00041000000000000005 0.42 AML other m 2021-03-21T21:26:13.03
IV.ATCC.EHE. ML:2.1 0.000395 0.16 AML other m 2021-03-21T21:26:13.76
IV.ATCC.EHN. ML:2.1 0.000407 1.1 AML other m 2021-03-21T21:26:13.27
IV.SACS.HNE. ML:1.6 0.000109198615 0.4096 AML other m 2021-03-21T21:26:14.36
IV.SACS.HNN. ML:1.7 0.00013414744000000002 0.8448 AML other m 2021-03-21T21:26:14.42
IV.NRCA.HHN. ML:2.1 0.00033650000000000005 0.12 AML other m 2021-03-21T21:26:15.14
IV.NRCA.HHE. ML:2.2 0.0003795 0.16 AML other m 2021-03-21T21:26:15.50
IV.MURB.HNE. ML:2.6 0.001245 0.2 AML other m 2021-03-21T21:26:15.50
IV.MURB.HHE. ML:2.7 0.00132 0.2 AML other m 2021-03-21T21:26:15.50
IV.LNSS.HHN. ML:2.5 0.000889 0.24 AML other m 2021-03-21T21:26:16.14
IV.MURB.HNN. ML:2.5 0.000875 0.18 AML other m 2021-03-21T21:26:16.15
IV.LNSS.HHE. ML:2.3 0.000575 0.4 AML other m 2021-03-21T21:26:16.74
IV.SACS.HHN. ML:1.7 0.00013000000000000002 1.2 AML other m 2021-03-21T21:26:18.93
IV.MURB.HHN. ML:2.5 0.000943 1.18 AML other m 2021-03-21T21:26:18.98
IV.SACS.HHE. ML:1.6 0.0001036 0.32 AML other m 2021-03-21T21:26:19.33
IV.CSP1.EHN. ML:2.4 0.00052581475 0.3584 AML other m 2021-03-21T21:26:20.36
IV.CSP1.EHE. ML:2.3 0.0004061285 0.3456 AML other m 2021-03-21T21:26:20.36
IV.RM33.EHE. ML:2.1 0.00022349999999999998 0.48 AML other m 2021-03-21T21:26:20.12
IV.SRES.HHE. ML:1.7 0.0001 0.64 AML other m 2021-03-21T21:26:20.58
IV.RM33.EHN. ML:2.1 0.0002175 1.2 AML other m 2021-03-21T21:26:21.23
IV.ATMI.HHN. ML:2.5 0.0006995 0.68 AML other m 2021-03-21T21:26:21.68
IV.GUMA.HHN. ML:2.3 0.00027850000000000005 0.26 AML other m 2021-03-21T21:26:21.82
IV.SMA1.EHE. ML:2.5 0.0005235 0.26 AML other m 2021-03-21T21:26:22.20
IV.SMA1.EHN. ML:2.3 0.00035 0.26 AML other m 2021-03-21T21:26:22.13
IV.GUMA.HHE. ML:2.1 0.0002117247 1.2288 AML other m 2021-03-21T21:26:21.59
IV.ATMI.HHE. ML:2.5 0.0006635 0.74 AML other m 2021-03-21T21:26:22.54
IV.SRES.HHN. ML:1.7 0.0000904 0.64 AML other m 2021-03-21T21:26:22.87
IV.EL6.EHE. ML:2.1 0.000205168485 0.1536 AML other m 2021-03-21T21:26:22.65
IV.BADI.EHN. ML:2.0 0.0001375 0.88 AML other m 2021-03-21T21:26:25.59
IV.EL6.EHN. ML:2.1 0.00017677104999999998 0.192 AML other m 2021-03-21T21:26:25.24
IV.BADI.EHE. ML:1.9 0.000122 0.56 AML other m 2021-03-21T21:26:27.08
IV.TERO.HHN. ML:1.9 0.0000949 0.46 AML other m 2021-03-21T21:26:29.41
IV.PARC.HHE. ML:2.0 0.00010400000000000001 1.46 AML other m 2021-03-21T21:26:31.01
IV.TERO.HHE. ML:1.8 0.00006620000000000001 1.36 AML other m 2021-03-21T21:26:31.76
IV.PARC.HHN. ML:2.0 0.00011399999999999999 1.04 AML other m 2021-03-21T21:26:31.93
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
Waveforms Seismic signals in miniseed + resp format Download