Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 05-09-2021 and time 09:52:06 (Italy) in region 1 km SW Massa Martana (PG)

A magnitude ML 1.5 earthquake occured in region: 1 km SW Massa Martana (PG), on

  • 05-09-2021 07:52:06 (UTC)
  • 05-09-2021 09:52:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7730, 12.5200 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 1 3770 3770
Giano dell'Umbria PG 8 3846 7616
Todi PG 9 16851 24467
Acquasparta TR 9 4778 29245
Castel Ritaldi PG 14 3278 32523
Montecastrilli TR 14 5022 37545
Avigliano Umbro TR 15 2558 40103
Collazzone PG 15 3473 43576
Monte Castello di Vibio PG 16 1567 45143
Gualdo Cattaneo PG 16 6155 51298
Fratta Todina PG 16 1839 53137
Montefalco PG 17 5679 58816
San Gemini TR 18 5018 63834
Spoleto PG 18 38218 102052
Bevagna PG 20 5081 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Foligno (57155 inhabitants)
26 Km NW of Terni (111501 inhabitants)
39 Km S of Perugia (166134 inhabitants)
52 Km NE of Viterbo (67173 inhabitants)
86 Km NW of L'Aquila (69753 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
96 Km NE of Civitavecchia (52991 inhabitants)
98 Km W of Teramo (54892 inhabitants)
98 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 1.5 2021-09-05
07:52:06		 42.7727 12.5202 8 2022-03-30
13:04:05		 Bollettino Sismico Italiano INGV 95379351
Reviewed
Rev100 		ML 1.4 2021-09-05
07:52:07		 42.7743 12.5412 8 2021-09-05
08:02:55		 Sala Sismica INGV-Roma 95064041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-05 07:52:06 ± 0.05
Latitude 42.7727 ± 0.0027
Longitude 12.5202 ± 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 95379351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 337
Semi-minor axis of confidence ellipse (meter) 227
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 78
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 36
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) 0.69068
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 22
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 95064041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-05 08:02:55

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 95379351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-13 10:52:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2021-09-05T07:52:45.00 3.0 undecidable manual S -1.13 0
IV.CSP1.EHZ. 2021-09-05T07:52:27.90 0.3 undecidable manual S 57 65.8896 50 0.33 67
IV.RM33.EHZ. 2021-09-05T07:52:27.02 0.3 undecidable manual S 117 63.7917 50 0.03 71
IV.MML1.EHZ. 2021-09-05T07:52:24.40 0.3 undecidable manual S 44 52.7028 50 0.37 68
IV.FDMO.HHZ. 2021-09-05T07:52:24.51 0.3 undecidable manual S 57 54.6009 50 -0.04 72
IV.NRCA.HHZ. 2021-09-05T07:52:23.12 0.6 undecidable manual S 82 48.8178 50 0.11 48
IV.ATCC.EHE. 2021-09-05T07:52:22.73 0.6 undecidable manual S 12 46.8198 50 0.27 47
IV.LNSS.HNZ. 2021-09-05T07:52:22.49 0.6 undecidable manual S 114 46.4202 50 0.13 48
IV.CAFI.HNN. 2021-09-05T07:52:20.25 0.3 undecidable manual P 324 76.368 50 -0.16 68
IV.MGAB.HHZ. 2021-09-05T07:52:20.05 0.3 undecidable manual S 295 36.6411 50 0.29 71
IV.SSFR.HHZ. 2021-09-05T07:52:20.11 0.6 undecidable manual P 16 76.6677 50 -0.35 43
IV.CESI.HHE. 2021-09-05T07:52:20.56 0.6 undecidable manual S 50 40.5261 50 -0.23 47
IV.BARO.HNZ. 2021-09-05T07:52:19.72 0.6 undecidable manual P 214 69.6747 50 0.33 44
IV.RM33.EHZ. 2021-09-05T07:52:18.22 0.3 undecidable manual P 117 63.7917 50 -0.25 68
IV.ASSB.HHZ. 2021-09-05T07:52:18.18 0.1 undecidable manual S 21 32.0457 104 -0.1 99
IV.CSP1.EHZ. 2021-09-05T07:52:18.83 0.3 undecidable manual P 57 65.8896 50 0.02 71
IV.SRES.HHN. 2021-09-05T07:52:17.47 0.1 undecidable manual P 181 59.3961 50 -0.34 90
IV.MURB.HHZ. 2021-09-05T07:52:17.16 0.3 undecidable manual P 0 54.4011 50 0.13 71
IV.ARRO.EHZ. 2021-09-05T07:52:17.68 0.3 undecidable manual S 137 29.3484 105 0.29 72
IV.ATVA.EHE. 2021-09-05T07:52:17.68 0.1 undecidable manual P 341 59.2962 50 -0.1 94
IV.NRCA.HHZ. 2021-09-05T07:52:16.03 0.3 undecidable manual P 82 48.8178 50 -0.14 71
IV.MML1.EHZ. 2021-09-05T07:52:16.81 0.3 undecidable manual P 44 52.7028 50 0.05 72
IV.SACS.HHE. 2021-09-05T07:52:16.08 0.3 undecidable manual P 280 50.4162 50 -0.34 68
IV.FDMO.HHZ. 2021-09-05T07:52:16.88 0.3 undecidable manual P 57 54.6009 50 -0.18 70
IV.LNSS.HNZ. 2021-09-05T07:52:15.53 0.1 undecidable manual P 114 46.4202 50 -0.27 93
IV.ATCC.EHE. 2021-09-05T07:52:15.56 0.6 undecidable manual P 12 46.8198 50 -0.3 46
IV.MGAB.HHZ. 2021-09-05T07:52:14.61 0.3 undecidable manual P 295 36.6411 50 0.31 70
IV.CESI.HHE. 2021-09-05T07:52:14.80 0.1 undecidable manual P 50 40.5261 50 -0.09 98
IV.CESX.HHZ. 2021-09-05T07:52:13.93 0.3 undecidable manual S 163 18.9699 113 -0.06 77
IV.ARRO.EHZ. 2021-09-05T07:52:13.19 0.3 undecidable manual P 137 29.3484 105 0.26 72
IV.ASSB.HHZ. 2021-09-05T07:52:13.54 0.3 undecidable manual P 21 32.0457 104 0.1 74
IV.GAVE.EHZ. 2021-09-05T07:52:13.26 0.3 undecidable manual P 106 31.746 104 -0.14 74
IV.CESX.HHZ. 2021-09-05T07:52:11.08 0.3 undecidable manual P 163 18.9699 113 0.12 76
IV.MOMA.HHZ. 2021-09-05T07:52:09.99 0.3 undecidable manual S 49 5.3946 146 -0.18 76
IT.GNU.HGZ. 2021-09-05T07:52:09.99 0.3 undecidable manual S 50 5.3946 146 -0.18 76
IV.MOMA.HHZ. 2021-09-05T07:52:09.03 0.1 undecidable manual P 49 5.3946 146 0.27 100
IT.GNU.HGZ. 2021-09-05T07:52:08.99 0.3 undecidable manual P 50 5.3946 146 0.23 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:1.4 0.00011999999999999999 0.18 AML other m 2021-09-05T07:52:18.72
IV.ARRO.EHE. ML:1.3 0.00010839999999999999 1 AML other m 2021-09-05T07:52:19.12
IV.ASSB.HHE. ML:1.3 0.00010015000000000001 1.2 AML other m 2021-09-05T07:52:19.93
IV.ASSB.HHN. ML:1.3 0.0001 1 AML other m 2021-09-05T07:52:19.57
IV.GAVE.EHE. ML:1.6 0.00019350000000000001 1.14 AML other m 2021-09-05T07:52:19.61
IV.MGAB.HHN. ML:1.6 0.0001375 0.44 AML other m 2021-09-05T07:52:21.30
IV.GAVE.EHN. ML:1.7 0.000216 0.54 AML other m 2021-09-05T07:52:21.33
IV.NRCA.HHE. ML:1.6 0.0001115 0.2 AML other m 2021-09-05T07:52:24.42
IV.MML1.EHN. ML:1.3 0.00004705 0.28 AML other m 2021-09-05T07:52:24.85
IV.MML1.EHE. ML:1.3 0.000049000000000000005 0.9 AML other m 2021-09-05T07:52:25.53
IV.FDMO.HHN. ML:1.4 0.00005415 0.24 AML other m 2021-09-05T07:52:26.03
IV.MGAB.HHE. ML:1.4 0.00011180000000000001 0.56 AML other m 2021-09-05T07:52:26.57
IV.MURB.HHE. ML:2.0 0.0002325 0.24 AML other m 2021-09-05T07:52:26.29
IV.FDMO.HHE. ML:1.3 0.000047300000000000005 0.26 AML other m 2021-09-05T07:52:26.43
IV.NRCA.HHN. ML:1.5 0.00007855 0.1 AML other m 2021-09-05T07:52:26.45
IV.MURB.HHN. ML:1.9 0.0002035 0.3 AML other m 2021-09-05T07:52:27.57
IV.RM33.EHN. ML:1.5 0.0000609 0.42 AML other m 2021-09-05T07:52:28.80
IV.CSP1.EHE. ML:1.8 0.0001119 0.52 AML other m 2021-09-05T07:52:28.64
IV.CSP1.EHN. ML:1.8 0.0001215 0.5 AML other m 2021-09-05T07:52:30.42
IV.RM33.EHE. ML:1.4 0.000051699999999999996 0.76 AML other m 2021-09-05T07:52:31.41
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