Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 11-06-2021 and time 23:02:20 (Italy) in region 1 km N Massa Martana (PG)

A magnitude ML 0.9 earthquake occured in region: 1 km N Massa Martana (PG), on

  • 11-06-2021 21:02:20 (UTC)
  • 11-06-2021 23:02:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7860, 12.5220 at 6 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 7 3846 7616
Todi PG 9 16851 24467
Acquasparta TR 11 4778 29245
Castel Ritaldi PG 13 3278 32523
Collazzone PG 14 3473 35996
Gualdo Cattaneo PG 14 6155 42151
Fratta Todina PG 15 1839 43990
Monte Castello di Vibio PG 15 1567 45557
Montecastrilli TR 15 5022 50579
Montefalco PG 16 5679 56258
Avigliano Umbro TR 16 2558 58816
Bevagna PG 18 5081 63897
Spoleto PG 19 38218 102115
San Gemini TR 19 5018 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Foligno (57155 inhabitants)
27 Km NW of Terni (111501 inhabitants)
37 Km S of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
89 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
98 Km NE of Civitavecchia (52991 inhabitants)
98 Km W of Teramo (54892 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 0.9 2021-06-11
21:02:20		 42.786 12.5215 6 2021-12-29
11:12:38		 Bollettino Sismico Italiano INGV 96732881
Reviewed
Rev100 		ML 0.9 2021-06-11
21:02:20		 42.7807 12.512 7 2021-06-11
21:14:13		 Sala Sismica INGV-Roma 91118531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-06-11 21:02:20 ± 0.1
Latitude 42.7860 ± 0.0036
Longitude 12.5215 ± 0.0074
Depth (km) 6 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96732881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 583
Semi-minor axis of confidence ellipse (meter) 339
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 266
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 23
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) 0.68888
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96732881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-18 17:32:29

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 91118531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-06-11 21:14:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-06-11T21:04:12.22 3.0 undecidable manual Sn -7.71 0
GU.RORO.HHZ. 2021-06-11T21:04:09.79 3.0 undecidable manual Sg 9.49 0
IV.CRAC.EHZ. 2021-06-11T21:04:01.57 3.0 undecidable manual Sg 7.71 0
IV.EUCT.HNZ. 2021-06-11T21:04:00.47 3.0 undecidable manual Sg 6.61 0
CR.STON.BHZ. 2021-06-11T21:03:50.88 3.0 undecidable manual Sg 5.14 0
AC.VLO.HHZ. 2021-06-11T21:03:47.67 3.0 undecidable manual Pg 14.46 0
IV.SARZ.HHZ. 2021-06-11T21:03:42.57 3.0 undecidable manual Sn -9.99 0
IV.ZEN8.EHZ. 2021-06-11T21:03:37.61 3.0 undecidable manual Sn -3.68 0
GU.BHB.HHZ. 2021-06-11T21:03:32.30 3.0 negative manual Pg 9.1 0
IV.MSRU.HHZ. 2021-06-11T21:03:27.68 3.0 undecidable manual Pn -2.14 0
IV.ESCV.HHZ. 2021-06-11T21:03:26.79 3.0 positive manual Pn -7.83 0
IV.MTMR.EHZ. 2021-06-11T21:03:25.07 3.0 undecidable manual Sn -2.5 0
IV.GIZZ.HHZ. 2021-06-11T21:03:20.32 3.0 undecidable manual Pn -3.47 0
IV.PAOL.HHZ. 2021-06-11T21:03:15.52 3.0 undecidable manual Sn -5.83 0
IV.EUCT.HNZ. 2021-06-11T21:03:12.44 3.0 undecidable manual Pg 3.3 0
IV.TDS.HHZ. 2021-06-11T21:03:10.52 3.0 undecidable manual Pn -5.93 0
GU.CANO.HHZ. 2021-06-11T21:03:08.56 3.0 positive manual Pn -2.89 0
IV.VOBA.EHZ. 2021-06-11T21:03:07.69 3.0 positive manual Pg 4.22 0
IV.FREG.HNZ. 2021-06-11T21:02:56.85 3.0 positive manual Pn -3.57 0
IV.CMPR.HHZ. 2021-06-11T21:02:55.89 3.0 undecidable manual Pn -7.19 0
IV.VITU.HHZ. 2021-06-11T21:02:54.70 3.0 undecidable manual Pg 5.39 0
IV.BRSN.EHZ. 2021-06-11T21:02:50.01 3.0 undecidable manual S -9.99 0
GU.GSCL.HHZ. 2021-06-11T21:02:49.19 3.0 positive manual Pg -1.64 0
IV.TREG.EHZ. 2021-06-11T21:02:49.23 3.0 positive manual Pn -9.23 0
IV.EL6.EHZ. 2021-06-11T21:02:45.40 0.3 undecidable manual S 38 76.4679 50 0.57 59
IV.CPGN.EHZ. 2021-06-11T21:02:42.45 3.0 undecidable manual S -5.14 0
IV.MMO1.EHZ. 2021-06-11T21:02:42.19 0.3 undecidable manual S 79 66.6777 50 -0.03 69
IV.CSP1.EHZ. 2021-06-11T21:02:41.93 0.3 undecidable manual S 58 65.0904 50 0.15 67
IV.MML1.HNZ. 2021-06-11T21:02:38.11 0.3 undecidable manual S 45 51.5151 50 -0.06 70
IV.EL6.EHZ. 2021-06-11T21:02:35.07 0.3 undecidable manual P 38 76.4679 50 0.36 63
IV.CESI.HNZ. 2021-06-11T21:02:34.48 0.3 undecidable manual S 52 39.5271 99 -0.29 69
IV.MMO1.EHZ. 2021-06-11T21:02:32.75 0.3 undecidable manual P 79 66.6777 50 -0.46 63
IV.GAVE.EHZ. 2021-06-11T21:02:32.45 0.3 undecidable manual S 109 32.1456 101 0.21 71
IV.CSP1.EHZ. 2021-06-11T21:02:32.69 0.3 undecidable manual P 58 65.0904 50 -0.27 66
IV.ARRO.EHZ. 2021-06-11T21:02:31.57 0.6 undecidable manual S 139 30.3474 102 -0.09 48
IV.ASSB.HHZ. 2021-06-11T21:02:31.67 0.3 undecidable manual S 21 30.5472 102 -0.06 73
IV.MML1.HNZ. 2021-06-11T21:02:31.02 0.3 undecidable manual P 45 51.5151 50 0.15 69
IV.CESX.HHZ. 2021-06-11T21:02:28.10 0.6 undecidable manual S 165 20.3685 107 -0.2 48
IV.CESI.HNZ. 2021-06-11T21:02:28.58 0.3 undecidable manual P 52 39.5271 99 -0.33 68
IV.MGAB.HHZ. 2021-06-11T21:02:28.12 0.3 undecidable manual P 293 36.1416 100 -0.13 71
IV.GAVE.EHZ. 2021-06-11T21:02:27.14 0.3 undecidable manual P 109 32.1456 101 -0.31 69
IV.ARRO.EHZ. 2021-06-11T21:02:27.07 0.3 undecidable manual P 139 30.3474 102 -0.04 73
IV.ASSB.HHZ. 2021-06-11T21:02:26.93 0.3 undecidable manual P 21 30.5472 102 -0.22 71
IV.CESX.HHZ. 2021-06-11T21:02:25.55 0.3 undecidable manual P 165 20.3685 107 0.37 70
IT.GNU.HGE. 2021-06-11T21:02:23.68 0.3 undecidable manual S 63 4.3956 145 0.11 76
IV.MOMA.HHZ. 2021-06-11T21:02:23.68 0.3 undecidable manual S 63 4.3956 145 0.11 76
IV.MOMA.HHZ. 2021-06-11T21:02:22.59 0.1 undecidable manual P 63 4.3956 145 0.16 100
IT.GNU.HGE. 2021-06-11T21:02:22.60 0.3 undecidable manual P 63 4.3956 145 0.16 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.2 0.00011399999999999999 0.16 AML other m 2021-06-11T21:02:29.15
IV.CESX.HHE. ML:1.0 0.00008044999999999999 0.28 AML other m 2021-06-11T21:02:30.94
IV.ASSB.HHN. ML:0.7 0.0000272 0.18 AML other m 2021-06-11T21:02:32.13
IV.ARRO.EHN. ML:1.0 0.00005025 0.2 AML other m 2021-06-11T21:02:32.77
IV.ASSB.HHE. ML:0.8 0.000029049999999999998 1.38 AML other m 2021-06-11T21:02:32.73
IV.ARRO.EHE. ML:0.9 0.0000383 1.28 AML other m 2021-06-11T21:02:33.06
IV.MGAB.HHN. ML:0.7 0.00002005 0.54 AML other m 2021-06-11T21:02:35.21
IV.MGAB.HHE. ML:0.8 0.000026700000000000002 1.64 AML other m 2021-06-11T21:02:36.03
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