Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 27-07-2021 and time 02:01:03 (Italy) in region 3 km E Massa Martana (PG)

A magnitude ML 1.4 earthquake occured in region: 3 km E Massa Martana (PG), on

  • 27-07-2021 00:01:03 (UTC)
  • 27-07-2021 02:01:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7820, 12.5640 at 7 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
Castel Ritaldi PG 10 3278 10894
Acquasparta TR 10 4778 15672
Todi PG 13 16851 32523
Gualdo Cattaneo PG 14 6155 38678
Montefalco PG 15 5679 44357
Spoleto PG 15 38218 82575
Montecastrilli TR 16 5022 87597
Collazzone PG 16 3473 91070
Bevagna PG 17 5081 96151
Avigliano Umbro TR 18 2558 98709
Campello sul Clitunno PG 18 2442 101151
Fratta Todina PG 18 1839 102990
Monte Castello di Vibio PG 18 1567 104557
Trevi PG 19 8469 113026
San Gemini TR 19 5018 118044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
26 Km N of Terni (111501 inhabitants)
39 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 N of Tivoli (56533 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
94 Km W of Teramo (54892 inhabitants)
99 Km N of Roma (2864731 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 1.4 2021-07-27
00:01:03		 42.7822 12.5637 7 2021-12-29
11:12:32		 Bollettino Sismico Italiano INGV 95744681
Reviewed
Rev100 		ML 1.4 2021-07-27
00:01:03		 42.7795 12.5365 8 2021-07-27
00:09:38		 Sala Sismica INGV-Roma 93255671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-27 00:01:03 ± 0.06
Latitude 42.7822 ± 0.0027
Longitude 12.5637 ± 0.0049
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95744681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 394
Semi-minor axis of confidence ellipse (meter) 248
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 44
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.69967
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 95744681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-22 14:49:45

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 29
Type of magnitude ML
Reference to an origin 93255671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-27 00:09:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VITU.HHZ. 2021-07-27T00:02:07.59 3.0 undecidable manual Sn -1.89 0
IV.FIR.HHZ. 2021-07-27T00:01:30.05 3.0 undecidable manual P 0.26 0
IV.FIAM.HHZ. 2021-07-27T00:01:26.80 0.6 undecidable manual S 141 72.7716 50 0.14 44
IV.SMA1.EHZ. 2021-07-27T00:01:24.90 0.6 undecidable manual S 105 65.0904 50 0.29 44
IV.CSP1.EHZ. 2021-07-27T00:01:24.30 0.3 undecidable manual S 56 62.3931 50 0.41 64
IV.FDMO.HHZ. 2021-07-27T00:01:21.00 0.6 undecidable manual S 56 51.1155 50 0.14 46
IV.MML1.EHZ. 2021-07-27T00:01:20.20 0.6 undecidable manual S 42 49.5171 50 -0.24 45
IV.ATCC.EHZ. 2021-07-27T00:01:19.50 0.6 undecidable manual S 8 45.1215 50 0.22 46
IV.NRCA.HHZ. 2021-07-27T00:01:19.30 0.6 undecidable manual S 83 45.2214 50 0.01 48
IV.MF5.EHZ. 2021-07-27T00:01:18.06 0.6 undecidable manual P 72 76.368 50 0.48 41
IV.LNSS.HHZ. 2021-07-27T00:01:18.66 0.3 undecidable manual S 117 43.623 50 -0.22 69
IV.CAFI.HNN. 2021-07-27T00:01:17.93 1.0 undecidable manual P 322 77.6667 50 0.15 22
IV.EL6.EHZ. 2021-07-27T00:01:17.58 0.6 undecidable manual P 36 74.7696 50 0.24 43
IV.FIAM.HHZ. 2021-07-27T00:01:16.77 0.3 undecidable manual P 141 72.7716 50 -0.27 65
IV.ATMI.HHZ. 2021-07-27T00:01:16.33 1.0 undecidable manual P 339 65.7897 50 0.38 21
IV.CESI.HHZ. 2021-07-27T00:01:16.80 0.3 undecidable manual S 48 37.1295 101 -0.21 70
IV.TB02.DHZ. 2021-07-27T00:01:16.45 1.0 undecidable manual P 349 66.4779 50 0.39 21
IV.SMA1.EHZ. 2021-07-27T00:01:15.79 0.3 undecidable manual P 105 65.0904 50 -0.06 69
IV.SRES.HHN. 2021-07-27T00:01:15.54 1.0 undecidable manual P 184 60.5949 50 0.38 22
IV.CSP1.EHZ. 2021-07-27T00:01:15.39 0.3 undecidable manual P 56 62.3931 50 -0.04 69
IV.ATLO.EHE. 2021-07-27T00:01:15.41 1.0 undecidable manual P 348 60.495 50 0.27 22
IV.RM33.EHZ. 2021-07-27T00:01:14.92 0.6 undecidable manual P 119 61.1943 50 -0.32 44
IV.ATVA.EHE. 2021-07-27T00:01:14.74 0.6 undecidable manual P 338 59.496 50 -0.25 45
IV.GAVE.EHZ. 2021-07-27T00:01:14.50 0.6 undecidable manual S 110 28.749 104 0.35 46
IV.MURB.HHE. 2021-07-27T00:01:14.44 1.0 undecidable manual P 357 53.4021 50 0.39 22
IV.ARRO.EHZ. 2021-07-27T00:01:14.20 0.6 undecidable manual S 144 27.8499 104 0.33 46
IV.ASSB.HHZ. 2021-07-27T00:01:14.40 0.6 undecidable manual S 15 29.9478 103 -0.16 48
IV.FDMO.HHZ. 2021-07-27T00:01:13.43 0.6 undecidable manual P 56 51.1155 50 -0.26 45
IV.MC2.EHZ. 2021-07-27T00:01:13.87 0.3 undecidable manual P 74 52.8027 50 -0.09 70
IV.MML1.EHZ. 2021-07-27T00:01:13.31 0.3 undecidable manual P 42 49.5171 50 -0.14 70
IV.SACS.HHE. 2021-07-27T00:01:13.72 0.6 undecidable manual P 278 53.7018 50 -0.38 44
IV.ATCC.EHZ. 2021-07-27T00:01:12.98 0.6 undecidable manual P 8 45.1215 50 0.21 46
IV.FEMA.HNE. 2021-07-27T00:01:12.62 1.0 undecidable manual P 63 44.3223 50 -0.02 24
IV.LNSS.HHZ. 2021-07-27T00:01:12.16 0.3 undecidable manual P 117 43.623 50 -0.39 67
IV.NRCA.HHZ. 2021-07-27T00:01:12.51 0.3 undecidable manual P 83 45.2214 50 -0.27 68
IT.MTCL.HGZ. 2021-07-27T00:01:12.29 0.6 undecidable manual P 56 42.5241 50 -0.08 48
IV.CESI.HHZ. 2021-07-27T00:01:11.40 0.3 undecidable manual P 48 37.1295 101 -0.06 72
IV.CESX.HHZ. 2021-07-27T00:01:11.00 0.6 undecidable manual S 174 19.3695 110 -0.04 50
IV.ASSB.HHZ. 2021-07-27T00:01:10.12 0.1 negative manual P 15 29.9478 103 0.07 98
IV.ARRO.EHZ. 2021-07-27T00:01:09.75 0.6 undecidable manual P 144 27.8499 104 0.1 49
IV.GAVE.EHZ. 2021-07-27T00:01:09.71 0.3 undecidable manual P 110 28.749 104 -0.1 73
IV.CESX.HHZ. 2021-07-27T00:01:08.12 0.3 undecidable manual P 174 19.3695 110 0.1 74
IT.GNU.HGZ. 2021-07-27T00:01:06.30 0.3 undecidable manual S 13 2.4975 161 -0.19 75
IV.MOMA.HHZ. 2021-07-27T00:01:06.40 0.3 undecidable manual S 12 2.4975 161 -0.09 76
IT.GNU.HGZ. 2021-07-27T00:01:05.57 0.1 positive manual P 13 2.4975 161 0.18 100
IV.MOMA.HHZ. 2021-07-27T00:01:05.56 0.3 undecidable manual P 12 2.4975 161 0.17 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHE. ML:1.4 0.0001905 0.54 AML other m 2021-07-27T00:01:13.51
IV.CESX.HHN. ML:1.4 0.0002175 0.24 AML other m 2021-07-27T00:01:14.34
IV.ASSB.HHE. ML:1.3 0.00011145 1.16 AML other m 2021-07-27T00:01:16.15
IV.ASSB.HHN. ML:1.3 0.0001075 0.3 AML other m 2021-07-27T00:01:16.16
IV.ARRO.EHN. ML:1.4 0.000146 0.24 AML other m 2021-07-27T00:01:16.61
IV.ARRO.EHE. ML:1.4 0.0001232 0.22 AML other m 2021-07-27T00:01:16.60
IV.CESI.HHN. ML:1.3 0.00008645 0.2 AML other m 2021-07-27T00:01:17.19
IV.CESI.HHE. ML:1.3 0.00007235 0.7 AML other m 2021-07-27T00:01:18.62
IV.ATCC.EHN. ML:1.3 0.00006584999999999999 0.5 AML other m 2021-07-27T00:01:23.09
IV.ATCC.EHE. ML:1.3 0.0000569 0.76 AML other m 2021-07-27T00:01:23.90
IV.RM33.EHN. ML:1.4 0.00004425 0.58 AML other m 2021-07-27T00:01:27.08
IV.RM33.EHE. ML:1.4 0.00004625 0.52 AML other m 2021-07-27T00:01:29.70
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