Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 03-08-2020 and time 21:46:52 (Italy) in region 4 km SE Massa Martana (PG)

A magnitude ML 1.2 earthquake occured in region: 4 km SE Massa Martana (PG), on

  • 03-08-2020 19:46:52 (UTC)
  • 03-08-2020 21:46:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7430, 12.5480 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 4 3770 3770
Acquasparta TR 6 4778 8548
Giano dell'Umbria PG 11 3846 12394
Montecastrilli TR 11 5022 17416
Todi PG 12 16851 34267
Castel Ritaldi PG 14 3278 37545
Avigliano Umbro TR 14 2558 40103
San Gemini TR 14 5018 45121
Spoleto PG 16 38218 83339
Gualdo Cattaneo PG 19 6155 89494
Montefalco PG 19 5679 95173
Collazzone PG 19 3473 98646
Monte Castello di Vibio PG 19 1567 100213
Fratta Todina PG 20 1839 102052

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NW of Terni (111501 inhabitants)
27 Km SW of Foligno (57155 inhabitants)
43 Km SE of Perugia (166134 inhabitants)
51 Km NE of Viterbo (67173 inhabitants)
82 Km NW of L'Aquila (69753 inhabitants)
84 Km N of Guidonia Montecelio (88673 inhabitants)
89 Km N of Tivoli (56533 inhabitants)
95 Km N of Roma (2864731 inhabitants)
95 Km W of Teramo (54892 inhabitants)
95 Km NE of Civitavecchia (52991 inhabitants)
97 Km SE of Arezzo (99543 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 1.2 2020-08-03
19:46:52		 42.7427 12.5483 9 2020-08-03
19:53:00		 Sala Sismica INGV-Roma 81622341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-03 19:46:52 ± 0.05
Latitude 42.7427 ± 0.0027
Longitude 12.5483 ± 0.0049
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 81622341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 387
Semi-minor axis of confidence ellipse (meter) 292
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
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) 130
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.06295
Epicentral distance of station farthest from the epicenter (degree) 0.54229
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 81622341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-03 19:53:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHE. 2020-08-03T19:47:09.92 0.6 undecidable manual S 53 54.6009 50 0.12 46
IV.NRCA.HHZ. 2020-08-03T19:47:07.95 0.6 undecidable manual S 77 47.1195 50 0.14 46
IV.LNSS.HHZ. 2020-08-03T19:47:06.78 0.6 undecidable manual S 111 43.0236 50 0.08 47
IV.MGAB.HHZ. 2020-08-03T19:47:06.03 0.6 undecidable manual S 298 40.2264 50 0.08 48
IV.ASSB.HHZ. 2020-08-03T19:47:04.11 0.6 undecidable manual S 15 34.4433 50 -0.31 46
IV.RM33.EHE. 2020-08-03T19:47:03.03 1.0 undecidable manual P 115 60.1953 50 -0.22 22
IV.FDMO.HHE. 2020-08-03T19:47:01.91 3.0 undecidable manual P 53 54.6009 50 -0.47 0
IV.NRCA.HHZ. 2020-08-03T19:47:01.17 0.3 negative manual P 77 47.1195 50 -0.06 71
IV.MGAB.HHZ. 2020-08-03T19:47:00.10 0.3 positive manual P 298 40.2264 50 -0.05 72
IV.LNSS.HHZ. 2020-08-03T19:47:00.43 0.3 undecidable manual P 111 43.0236 50 -0.16 70
IV.ASSB.HHZ. 2020-08-03T19:46:59.62 1.0 undecidable manual P 15 34.4433 50 0.34 23
IV.CESX.HHZ. 2020-08-03T19:46:58.22 0.6 undecidable manual S 168 15.1737 120 -0.11 49
IV.ARRO.EHZ. 2020-08-03T19:46:57.78 1.0 undecidable manual P 136 25.3524 109 0.17 24
IV.MOMA.HHZ. 2020-08-03T19:46:55.91 0.6 undecidable manual S 15 6.993 141 -0.22 49
IT.GNU.HGE. 2020-08-03T19:46:55.99 0.6 undecidable manual S 15 6.993 141 -0.13 50
IV.CESX.HHZ. 2020-08-03T19:46:55.82 1.0 undecidable manual P 168 15.1737 120 0.06 25
IV.MOMA.HHZ. 2020-08-03T19:46:54.61 0.1 positive manual P 15 6.993 141 0.12 100
IT.GNU.HGE. 2020-08-03T19:46:54.64 0.1 undecidable manual P 15 6.993 141 0.16 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.6 0.00066692595 0.2048 AML other m 2020-08-03T19:46:56.15
IV.MOMA.HHN. ML:1.6 0.0007716902999999999 0.256 AML other m 2020-08-03T19:46:56.09
IV.MOMA.HNE. ML:1.6 0.00061615445 0.1664 AML other m 2020-08-03T19:46:56.17
IV.MOMA.HNN. ML:1.6 0.0007823801500000001 0.2048 AML other m 2020-08-03T19:46:56.22
IV.CESX.HHE. ML:0.9 0.00008244259 0.4736 AML other m 2020-08-03T19:47:02.34
IV.CESX.HHN. ML:0.9 0.00007282276 0.1792 AML other m 2020-08-03T19:47:00.77
IV.ARRO.EHE. ML:0.8 0.000038142175 0.2944 AML other m 2020-08-03T19:47:03.80
IV.ARRO.EHN. ML:0.8 0.0000389725425 0.192 AML other m 2020-08-03T19:47:03.91
IV.ASSB.HHE. ML:0.7 0.000022045825 0.1024 AML other m 2020-08-03T19:47:04.96
IV.ASSB.HHN. ML:0.8 0.000024690755 0.1408 AML other m 2020-08-03T19:47:04.32
IV.MGAB.HHE. ML:1.3 0.00007552262 0.2688 AML other m 2020-08-03T19:47:07.26
IV.MGAB.HHN. ML:1.2 0.000053681259999999994 0.1664 AML other m 2020-08-03T19:47:06.92
IV.MGAB.HNE. ML:1.5 0.000102612935 0.384 AML other m 2020-08-03T19:47:07.12
IV.NRCA.HHE. ML:1.2 0.000046708025 0.1152 AML other m 2020-08-03T19:47:10.32
IV.NRCA.HHN. ML:1.2 0.000041181085 0.1408 AML other m 2020-08-03T19:47:09.68
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