Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 27-07-2020 and time 08:06:19 (UTC) in region 1 km W Massa Martana (PG)

A magnitude ML 1.1 earthquake occured in region: 1 km W Massa Martana (PG), on

  • 27-07-2020 08:06:19 (UTC)
  • 27-07-2020 10:06:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7750, 12.5080 at 9 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Todi PG 8 16851 20621
Giano dell'Umbria PG 9 3846 24467
Acquasparta TR 10 4778 29245
Montecastrilli TR 14 5022 34267
Castel Ritaldi PG 15 3278 37545
Collazzone PG 15 3473 41018
Monte Castello di Vibio PG 15 1567 42585
Avigliano Umbro TR 15 2558 45143
Fratta Todina PG 15 1839 46982
Gualdo Cattaneo PG 16 6155 53137
Montefalco PG 18 5679 58816
San Gemini TR 18 5018 63834
Spoleto PG 19 38218 102052
Bevagna PG 20 5081 107133

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km SW of Foligno (57155 inhabitants)
26 Km NW of Terni (111501 inhabitants)
38 Km S of Perugia (166134 inhabitants)
52 Km NE of Viterbo (67173 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km SE of Arezzo (99543 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
96 Km NE of Civitavecchia (52991 inhabitants)
98 Km N of Roma (2864731 inhabitants)
99 Km W of Teramo (54892 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
Reviewed
Rev100 		ML 1.1 2020-07-27
08:06:19		 42.7753 12.5083 9 2020-07-27
08:18:55		 Sala Sismica INGV-Roma 81396801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-27 08:06:19 ± 0.1
Latitude 42.7753 ± 0.0063
Longitude 12.5083 ± 0.0086
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81396801

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 811
Semi-minor axis of confidence ellipse (meter) 538
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 810.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 13
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) 0.32106
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 81396801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-27 08:18:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.STON.BHZ. 2020-07-27T08:08:04.06 3.0 undecidable manual Sn 3.72 0
IV.EUCT.HNZ. 2020-07-27T08:08:02.78 3.0 undecidable manual Sg 11.11 0
IV.CMPR.HHZ. 2020-07-27T08:07:44.81 3.0 undecidable manual Sn -2.61 0
IV.ILOS.HNZ. 2020-07-27T08:07:34.99 3.0 negative manual Pn 5.8 0
IV.GATE.HNZ. 2020-07-27T08:07:26.55 3.0 undecidable manual Sg 5.03 0
IV.CAR1.HHZ. 2020-07-27T08:07:26.47 3.0 undecidable manual Pn 0.39 0
GU.MGRO.HHZ. 2020-07-27T08:07:22.67 3.0 positive manual Pg 8.27 0
IT.PLTA.HNZ. 2020-07-27T08:07:15.13 3.0 undecidable manual Sn 0.57 0
IV.EUCT.HNZ. 2020-07-27T08:07:12.45 3.0 negative manual Pn 1.43 0
IV.MCRV.HHZ. 2020-07-27T08:07:06.94 3.0 positive manual Pn 4.07 0
IV.MRB1.HHZ. 2020-07-27T08:07:00.28 3.0 positive manual Pn 2.21 0
IV.RIBO.EHZ.01 2020-07-27T08:06:39.47 3.0 positive manual P 0.04 0
IV.MGAB.HHZ. 2020-07-27T08:06:31.81 0.6 undecidable manual S 295 35.6421 50 -0.22 62
IV.ARVD.HHZ. 2020-07-27T08:06:31.57 3.0 undecidable manual P -1.79 0
IV.GAVE.EHZ. 2020-07-27T08:06:31.19 0.6 undecidable manual S 106 32.745 50 -0.08 65
IV.ARRO.EHZ. 2020-07-27T08:06:30.43 0.6 undecidable manual S 136 30.2475 50 -0.16 64
IV.MGAB.HHZ. 2020-07-27T08:06:27.07 1.0 positive manual P 295 35.6421 50 0.27 31
IV.GAVE.EHZ. 2020-07-27T08:06:26.64 0.6 negative manual P 106 32.745 50 0.29 62
IV.CESX.HHZ. 2020-07-27T08:06:26.78 0.6 undecidable manual S 161 19.5693 115 -0.37 62
IV.ARRO.EHZ. 2020-07-27T08:06:26.10 0.6 negative manual P 136 30.2475 50 0.14 64
IV.ASSB.HHZ. 2020-07-27T08:06:25.88 1.0 undecidable manual P 22 32.0457 50 -0.37 30
IV.CESX.HHZ. 2020-07-27T08:06:24.36 0.6 undecidable manual P 161 19.5693 115 0.38 62
IV.MOMA.HHZ. 2020-07-27T08:06:23.19 0.6 undecidable manual S 58 5.994 147 -0.25 65
IT.GNU.HGN. 2020-07-27T08:06:23.37 0.6 undecidable manual S 58 5.994 147 -0.08 68
IT.GNU.HGN. 2020-07-27T08:06:22.00 0.6 undecidable manual P 58 5.994 147 0.16 67
IV.MOMA.HHZ. 2020-07-27T08:06:21.99 0.3 negative manual P 58 5.994 147 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.6 0.0006820521 0.1152 AML other m 2020-07-27T08:06:23.40
IV.MOMA.HHN. ML:1.4 0.0004038796 0.1152 AML other m 2020-07-27T08:06:23.80
IV.MOMA.HNE. ML:1.5 0.0006227017500000001 0.1216 AML other m 2020-07-27T08:06:23.72
IV.CESX.HHE. ML:0.8 0.00004984595 0.2624 AML other m 2020-07-27T08:06:28.80
IV.CESX.HHN. ML:0.9 0.000055910834999999996 0.32 AML other m 2020-07-27T08:06:28.96
IV.ARRO.EHE. ML:0.9 0.00003490775 0.224 AML other m 2020-07-27T08:06:31.82
IV.ARRO.EHN. ML:0.9 0.000033719275 0.2048 AML other m 2020-07-27T08:06:31.92
IV.GAVE.EHE. ML:0.8 0.00002848474 0.16 AML other m 2020-07-27T08:06:33.97
IV.GAVE.EHN. ML:0.8 0.000031886405 0.1792 AML other m 2020-07-27T08:06:34.66
IV.MGAB.HHE. ML:1.0 0.000042571189999999996 0.3392 AML other m 2020-07-27T08:06:34.47
IV.MGAB.HHN. ML:1.1 0.00004814807 0.16 AML other m 2020-07-27T08:06:33.08
IV.MGAB.HNE. ML:1.6 0.0001422594 0.7104 AML other m 2020-07-27T08:06:31.29
IV.MGAB.HNN. ML:1.4 0.00009480883 0.4928 AML other m 2020-07-27T08:06:35.77
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