Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 06-08-2020 and time 21:58:33 (Italy) in region 5 km SE Massa Martana (PG)

A magnitude ML 1.1 earthquake occured in region: 5 km SE Massa Martana (PG), on

  • 06-08-2020 19:58:33 (UTC)
  • 06-08-2020 21:58:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7540, 12.5720 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 5 3770 3770
Acquasparta TR 7 4778 8548
Giano dell'Umbria PG 9 3846 12394
Castel Ritaldi PG 11 3278 15672
Montecastrilli TR 13 5022 20694
Spoleto PG 14 38218 58912
Todi PG 14 16851 75763
San Gemini TR 16 5018 80781
Avigliano Umbro TR 16 2558 83339
Montefalco PG 17 5679 89018
Gualdo Cattaneo PG 17 6155 95173
Campello sul Clitunno PG 18 2442 97615
Collazzone PG 19 3473 101088
Trevi PG 20 8469 109557

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km N of Terni (111501 inhabitants)
25 Km SW of Foligno (57155 inhabitants)
42 Km SE of Perugia (166134 inhabitants)
53 Km NE of Viterbo (67173 inhabitants)
81 Km NW of L'Aquila (69753 inhabitants)
85 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
93 Km W of Teramo (54892 inhabitants)
96 Km N of Roma (2864731 inhabitants)
97 Km SE of Arezzo (99543 inhabitants)
97 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 1.1 2020-08-06
19:58:33		 42.754 12.5718 8 2020-11-19
12:37:05		 Bollettino Sismico Italiano INGV 83955871
Reviewed
Rev100 		ML 1.1 2020-08-06
19:58:33		 42.7448 12.5478 9 2020-08-06
20:06:23		 Sala Sismica INGV-Roma 81710331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-06 19:58:33 ± 0.05
Latitude 42.7540 ± 0.0027
Longitude 12.5718 ± 0.0049
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 83955871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 362
Semi-minor axis of confidence ellipse (meter) 300
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 269
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 39
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.72485
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 81710331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-06 20:06:23

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 83955871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-10-20 13:35:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VVLD.HHZ. 2020-08-06T19:59:14.39 3.0 undecidable manual S 0.18 0
IV.PTRJ.HHZ. 2020-08-06T19:59:12.96 3.0 undecidable manual Pg 4.85 0
IV.FDMO.HHZ. 2020-08-06T19:58:51.36 0.3 undecidable manual S 53 52.3032 50 0.26 69
IV.NRCA.HHZ. 2020-08-06T19:58:49.50 0.3 undecidable manual S 79 45.0216 50 0.34 68
IV.FEMA.HNE. 2020-08-06T19:58:49.61 0.3 undecidable manual S 59 45.2214 50 0.41 67
IV.LNSS.HNZ. 2020-08-06T19:58:48.25 0.6 undecidable manual S 114 41.7249 50 -0.03 49
IV.CAFI.HNN. 2020-08-06T19:58:48.10 0.6 undecidable manual P 323 80.4639 50 -0.1 45
IV.CESI.HHE. 2020-08-06T19:58:47.50 0.6 undecidable manual S 44 38.8278 50 0 49
IV.LATE.HHN. 2020-08-06T19:58:46.14 0.3 undecidable manual P 256 64.491 50 0.41 65
IV.BARO.HNZ. 2020-08-06T19:58:46.79 0.1 undecidable manual P 217 70.4739 50 0.14 91
IV.ASSB.HHZ. 2020-08-06T19:58:45.42 0.3 undecidable manual S 12 32.745 103 -0.22 71
IV.FOSV.HNE. 2020-08-06T19:58:45.03 0.6 undecidable manual P 14 61.8936 50 -0.3 44
IV.CSP1.EHZ. 2020-08-06T19:58:45.56 0.3 undecidable manual P 54 63.5919 50 -0.04 70
IV.RM33.EHZ. 2020-08-06T19:58:44.66 0.3 undecidable manual P 117 59.0964 50 -0.24 68
IV.SRES.HHN. 2020-08-06T19:58:44.88 0.6 undecidable manual P 185 57.5979 50 0.22 46
IV.MURB.HHZ. 2020-08-06T19:58:44.40 0.6 undecidable manual P 356 56.5989 50 -0.12 47
IV.SACS.HHE. 2020-08-06T19:58:44.46 0.3 undecidable manual P 281 54.9006 50 0.21 69
IV.GAVE.EHZ. 2020-08-06T19:58:43.84 0.3 undecidable manual S 105 27.1506 106 0.09 74
IV.ATCC.EHE. 2020-08-06T19:58:43.37 0.6 undecidable manual P 7 48.1185 50 0.16 47
IV.FEMA.HNE. 2020-08-06T19:58:43.15 0.3 undecidable manual P 59 45.2214 50 0.39 67
IV.MML1.HNE. 2020-08-06T19:58:43.35 0.6 undecidable manual P 39 51.4152 50 -0.37 45
IV.FDMO.HHZ. 2020-08-06T19:58:43.68 0.3 undecidable manual P 53 52.3032 50 -0.17 70
IT.MTCL.HGZ. 2020-08-06T19:58:42.49 0.1 undecidable manual P 52 43.8228 50 -0.05 97
IV.NRCA.HHZ. 2020-08-06T19:58:42.58 0.1 undecidable manual P 79 45.0216 50 -0.15 95
IV.CESI.HHE. 2020-08-06T19:58:41.54 0.1 undecidable manual P 44 38.8278 50 -0.23 94
IV.LNSS.HNZ. 2020-08-06T19:58:41.98 0.1 undecidable manual P 114 41.7249 50 -0.25 93
IV.MGAB.HHZ. 2020-08-06T19:58:41.65 0.6 undecidable manual P 295 41.3253 50 -0.51 44
IV.CESX.HHZ. 2020-08-06T19:58:40.01 0.3 undecidable manual S 176 16.1727 116 -0.18 74
IV.ASSB.HHZ. 2020-08-06T19:58:40.39 0.1 undecidable manual P 12 32.745 103 -0.31 94
IV.GAVE.EHZ. 2020-08-06T19:58:39.52 0.1 undecidable manual P 105 27.1506 106 -0.09 99
IV.ARRO.EHZ. 2020-08-06T19:58:39.36 0.1 undecidable manual P 141 25.0527 107 0.16 98
IV.CESX.HHZ. 2020-08-06T19:58:37.42 0.1 undecidable manual P 176 16.1727 116 -0.13 100
IT.GNU.HGZ. 2020-08-06T19:58:37.42 0.3 undecidable manual S 359 5.4945 145 0.15 76
IV.MOMA.HHZ. 2020-08-06T19:58:37.35 0.3 undecidable manual S 359 5.4945 145 0.08 77
IT.GNU.HGZ. 2020-08-06T19:58:36.08 0.3 undecidable manual P 359 5.4945 145 0.21 75
IV.MOMA.HHZ. 2020-08-06T19:58:36.12 0.1 positive manual P 359 5.4945 145 0.25 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.0 0.00010365000000000001 0.94 AML other m 2020-08-06T19:58:40.72
IV.CESX.HHE. ML:1.0 0.0001052 1.74 AML other m 2020-08-06T19:58:41.03
IV.ARRO.EHE. ML:0.9 0.0000471 0.28 AML other m 2020-08-06T19:58:44.73
IV.ARRO.EHN. ML:1.0 0.00005555 0.58 AML other m 2020-08-06T19:58:45.07
IV.GAVE.EHN. ML:1.1 0.0000668 0.92 AML other m 2020-08-06T19:58:45.01
IV.ASSB.HHN. ML:0.9 0.0000363 0.64 AML other m 2020-08-06T19:58:45.68
IV.GAVE.EHE. ML:1.2 0.00008484999999999999 0.94 AML other m 2020-08-06T19:58:45.73
IV.ASSB.HHE. ML:0.8 0.000029650000000000002 1.26 AML other m 2020-08-06T19:58:47.09
IV.MGAB.HHN. ML:1.3 0.00006815 0.16 AML other m 2020-08-06T19:58:48.56
IV.MGAB.HHE. ML:1.4 0.00008505000000000001 0.28 AML other m 2020-08-06T19:58:48.66
IV.NRCA.HHE. ML:1.2 0.000048549999999999994 1.88 AML other m 2020-08-06T19:58:50.97
IV.NRCA.HHN. ML:1.2 0.000043950000000000004 0.9 AML other m 2020-08-06T19:58:51.89
IV.FDMO.HHN. ML:1.0 0.000022499999999999998 1.1 AML other m 2020-08-06T19:58:52.35
IV.FDMO.HHE. ML:0.9 0.0000197 0.94 AML other m 2020-08-06T19:58:53.85
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