Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 22-03-2021 and time 19:22:26 (Italy) in region 5 km NW Massa Martana (PG)

A magnitude ML 1.7 earthquake occured in region: 5 km NW Massa Martana (PG), on

  • 22-03-2021 18:22:26 (UTC)
  • 22-03-2021 19:22:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8190, 12.5010 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 5 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 9 16851 24467
Collazzone PG 10 3473 27940
Gualdo Cattaneo PG 11 6155 34095
Fratta Todina PG 12 1839 35934
Monte Castello di Vibio PG 12 1567 37501
Castel Ritaldi PG 14 3278 40779
Acquasparta TR 15 4778 45557
Montefalco PG 15 5679 51236
Bevagna PG 16 5081 56317
Marsciano PG 17 18902 75219
Montecastrilli TR 19 5022 80241
Avigliano Umbro TR 19 2558 82799
Deruta PG 19 9669 92468
San Venanzo TR 20 2218 94686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
31 Km NW of Terni (111501 inhabitants)
33 Km S of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
88 Km SE of Arezzo (99543 inhabitants)
90 Km NW of L'Aquila (69753 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
98 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 1.7 2021-03-22
18:22:26		 42.8188 12.5012 8 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91272041
Reviewed
Rev100 		ML 1.7 2021-03-22
18:22:26		 42.8223 12.5012 8 2021-03-22
18:29:17		 Sala Sismica INGV-Roma 88388451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-22 18:22:26 ± 0.05
Latitude 42.8188 ± 0.0027
Longitude 12.5012 ± 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 91272041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 293
Semi-minor axis of confidence ellipse (meter) 287
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 96
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 59
Number of defining phases 50
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.79320
Number of stations at which the event was observed 47
Number of stations from which data was used for origin computation 38
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 14
Type of magnitude ML
Reference to an origin 91272041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-14 12:52:35

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 88388451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-22 18:29:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MILN.HNZ. 2021-03-22T18:24:04.83 3.0 undecidable manual Sn 0.6 0
IV.GALF.HHZ. 2021-03-22T18:24:01.66 3.0 positive manual Pg 16.26 0
IV.ECTS.HHZ. 2021-03-22T18:23:59.98 3.0 positive manual Pg 14.85 0
IV.MBAL.EHZ. 2021-03-22T18:23:54.95 3.0 undecidable manual Sn 1.49 0
IV.SARZ.HHZ. 2021-03-22T18:23:29.58 3.0 undecidable manual Pg 11.71 0
IV.PTRJ.HNZ. 2021-03-22T18:23:26.89 3.0 undecidable manual Sn -1.04 0
IV.MCRV.HHZ. 2021-03-22T18:23:11.27 3.0 undecidable manual Pn 0.07 0
IV.IFOR.HHZ. 2021-03-22T18:23:10.91 3.0 undecidable manual Pg 6.76 0
IV.PAOL.HHZ. 2021-03-22T18:23:07.23 3.0 undecidable manual Pn 2.75 0
IV.MMO1.EHN. 2021-03-22T18:22:47.73 0.6 undecidable manual S 82 67.7766 50 0.34 57
IV.TB02.DHZ.01 2021-03-22T18:22:45.81 1.0 undecidable manual S 353 61.5939 50 0.06 30
IV.MC2.EHZ. 2021-03-22T18:22:44.92 1.0 undecidable manual S 79 56.8986 50 0.44 28
IV.MML1.HNE. 2021-03-22T18:22:42.80 0.6 undecidable manual S 49 50.3163 50 0.08 62
IV.NARO.HHZ. 2021-03-22T18:22:41.69 1.0 undecidable manual P 4 88.0452 50 0.16 28
IT.MTCL.HGZ. 2021-03-22T18:22:41.20 0.6 undecidable manual S 64 44.9217 50 -0.09 62
IV.FRON.EHZ. 2021-03-22T18:22:40.53 1.0 undecidable manual P 13 79.6647 50 0.31 28
IV.ATCC.EHZ. 2021-03-22T18:22:40.24 0.6 undecidable manual S 15 42.1245 50 -0.31 60
IV.BARO.HNZ. 2021-03-22T18:22:39.46 1.0 undecidable manual P 210 73.2711 50 0.22 29
IV.ATBU.EHZ. 2021-03-22T18:22:39.46 1.0 undecidable manual P 3 72.9714 50 0.26 29
IV.ATMC.EHE. 2021-03-22T18:22:39.72 1.0 undecidable manual P 340 73.9704 50 0.36 28
IV.CESI.HHZ. 2021-03-22T18:22:39.43 0.6 undecidable manual S 58 38.7279 50 -0.21 61
IV.ATPC.HHE. 2021-03-22T18:22:39.74 1.0 undecidable manual P 357 73.4709 50 0.46 27
IV.EL6.EHE. 2021-03-22T18:22:39.46 1.0 undecidable manual P 40 74.6697 50 0 30
IV.ATPI.EHE. 2021-03-22T18:22:39.01 1.0 undecidable manual P 354 70.5738 50 0.18 29
IV.SSFR.HHN. 2021-03-22T18:22:39.07 1.0 undecidable manual P 18 72.1722 50 0 30
IV.RM33.HNE. 2021-03-22T18:22:38.70 1.0 undecidable manual P 120 67.5768 50 0.33 28
IV.ATSC.EHE. 2021-03-22T18:22:38.97 1.0 undecidable manual P 13 68.7756 50 0.42 28
IV.GAVE.EHZ. 2021-03-22T18:22:38.75 1.0 undecidable manual S 114 34.9428 103 0.21 31
IV.TB03.DHZ.01 2021-03-22T18:22:38.32 1.0 undecidable manual P 354 64.9905 50 0.34 28
IV.CAFI.HHZ. 2021-03-22T18:22:38.70 1.0 undecidable manual P 323 71.2731 50 -0.24 29
IV.MMO1.EHN. 2021-03-22T18:22:38.20 0.6 undecidable manual P 82 67.7766 50 -0.19 59
IV.CSP1.EHZ. 2021-03-22T18:22:38.13 1.0 undecidable manual P 62 64.6908 50 0.21 29
IV.SRES.HHN. 2021-03-22T18:22:38.09 1.0 undecidable manual P 179 64.5909 50 0.19 29
IV.SNTG.HHE. 2021-03-22T18:22:37.44 1.0 undecidable manual P 36 60.0954 50 0.22 29
IV.ATMI.HHZ. 2021-03-22T18:22:37.29 1.0 undecidable manual P 342 60.1953 50 0.06 31
IV.TB01.DHZ.01 2021-03-22T18:22:37.69 1.0 undecidable manual P 355 62.5929 50 0.08 30
IV.TB02.DHZ.01 2021-03-22T18:22:37.42 1.0 undecidable manual P 353 61.5939 50 -0.03 31
IV.ATVA.EHE. 2021-03-22T18:22:36.06 1.0 undecidable manual P 341 53.9016 50 -0.2 30
IV.MC2.EHZ. 2021-03-22T18:22:36.57 1.0 undecidable manual P 79 56.8986 50 -0.15 30
IV.ATLO.EHE. 2021-03-22T18:22:36.47 1.0 undecidable manual P 352 55.5999 50 -0.05 31
IV.LNSS.HHZ. 2021-03-22T18:22:35.40 0.6 undecidable manual P 118 50.0166 50 -0.27 59
IV.SACS.HHZ. 2021-03-22T18:22:35.36 0.6 undecidable manual P 274 48.2184 50 -0.03 63
IV.MML1.HNE. 2021-03-22T18:22:35.48 1.0 undecidable manual P 49 50.3163 50 -0.22 30
IV.MURB.HHZ. 2021-03-22T18:22:35.89 1.0 undecidable manual P 2 49.3173 50 0.34 29
IV.ASSB.HHZ. 2021-03-22T18:22:35.99 0.6 undecidable manual S 27 27.9498 106 -0.17 63
IT.MTCL.HGZ. 2021-03-22T18:22:35.09 1.0 undecidable manual P 64 44.9217 50 0.22 30
IV.NRCA.HHZ. 2021-03-22T18:22:35.38 0.6 undecidable manual P 88 49.9167 50 -0.26 60
IV.ATCC.EHZ. 2021-03-22T18:22:34.18 0.3 positive manual P 15 42.1245 50 -0.27 91
IV.CESX.HHZ. 2021-03-22T18:22:34.75 0.6 undecidable manual S 163 24.3534 108 -0.23 63
IV.GAVE.EHZ. 2021-03-22T18:22:33.13 0.6 undecidable manual P 114 34.9428 103 -0.15 63
IV.CESI.HHZ. 2021-03-22T18:22:33.67 0.6 undecidable manual P 58 38.7279 50 -0.25 61
IV.ARRO.EHZ. 2021-03-22T18:22:33.06 0.6 positive manual P 141 34.2435 103 -0.08 64
IV.MGAB.HHZ. 2021-03-22T18:22:32.71 0.6 undecidable manual P 288 33.2445 103 -0.25 62
IV.ASSB.HHZ. 2021-03-22T18:22:31.89 0.6 undecidable manual P 27 27.9498 106 -0.02 65
IV.CESX.HHZ. 2021-03-22T18:22:31.23 0.6 undecidable manual P 163 24.3534 108 -0.01 66
IV.MOMA.HHZ. 2021-03-22T18:22:29.19 0.6 undecidable manual S 107 5.8941 143 -0.29 64
IT.GNU.HGE. 2021-03-22T18:22:29.58 0.3 undecidable manual S 107 5.8941 143 0.09 100
IV.MOMA.HHZ. 2021-03-22T18:22:28.30 0.3 undecidable manual P 107 5.8941 143 0.24 97
IT.GNU.HGE. 2021-03-22T18:22:28.33 0.3 undecidable manual P 107 5.8941 143 0.27 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.6 0.00016549999999999998 1.24 AML other m 2021-03-22T18:22:39.71
IV.GAVE.EHE. ML:1.7 0.00020649999999999998 0.18 AML other m 2021-03-22T18:22:39.34
IV.MGAB.HHN. ML:1.7 0.00021200000000000003 0.46 AML other m 2021-03-22T18:22:39.69
IV.MGAB.HHE. ML:1.7 0.000201 0.14 AML other m 2021-03-22T18:22:39.48
IV.CESI.HHN. ML:1.8 0.000223 1.76 AML other m 2021-03-22T18:22:40.00
IV.MGAB.HNE. ML:1.8 0.000249 0.92 AML other m 2021-03-22T18:22:40.48
IV.MGAB.HNN. ML:1.8 0.0002895 0.64 AML other m 2021-03-22T18:22:40.37
IV.CESI.HHE. ML:1.6 0.00014450000000000002 1.18 AML other m 2021-03-22T18:22:40.22
IV.ATCC.EHE. ML:1.8 0.00019700000000000002 1.6 AML other m 2021-03-22T18:22:41.81
IV.ATCC.EHN. ML:1.8 0.0002125 1.48 AML other m 2021-03-22T18:22:41.94
IV.NRCA.HHN. ML:1.8 0.0001505 0.76 AML other m 2021-03-22T18:22:44.98
IV.LNSS.HHN. ML:1.8 0.00016149999999999997 0.92 AML other m 2021-03-22T18:22:44.35
IV.NRCA.HHE. ML:1.7 0.00011999999999999999 0.7 AML other m 2021-03-22T18:22:47.65
IV.LNSS.HHE. ML:1.7 0.0001208 0.54 AML other m 2021-03-22T18:22:48.67
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