Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 15-08-2020 and time 04:45:21 (UTC) in region 4 km NW Montefranco (TR)

A magnitude ML 0.7 earthquake occured in region: 4 km NW Montefranco (TR), on

  • 15-08-2020 04:45:21 (UTC)
  • 15-08-2020 06:45:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6230, 12.7340 at 11 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
Montefranco TR 4 1276 1276
Ferentillo TR 5 1913 3189
Arrone TR 5 2763 5952
Terni TR 10 111501 117453
Polino TR 10 233 117686
Labro RI 12 374 118060
Spoleto PG 13 38218 156278
Scheggino PG 13 461 156739
Morro Reatino RI 13 373 157112
Colli sul Velino RI 14 533 157645
Stroncone TR 15 4917 162562
Sant'Anatolia di Narco PG 15 564 163126
San Gemini TR 15 5018 168144
Rivodutri RI 15 1253 169397
Acquasparta TR 17 4778 174175
Monteleone di Spoleto PG 18 599 174774
Poggio Bustone RI 18 2055 176829
Greccio RI 19 1558 178387
Poggiodomo PG 19 117 178504
Vallo di Nera PG 20 364 178868

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km NE of Terni (111501 inhabitants)
37 Km S of Foligno (57155 inhabitants)
56 Km E of Viterbo (67173 inhabitants)
61 Km SE of Perugia (166134 inhabitants)
62 Km W of L'Aquila (69753 inhabitants)
69 Km N of Guidonia Montecelio (88673 inhabitants)
73 Km N of Tivoli (56533 inhabitants)
80 Km W of Teramo (54892 inhabitants)
84 Km N of Roma (2864731 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
Reviewed
Rev100 		ML 0.7 2020-08-15
04:45:21		 42.6228 12.734 11 2020-08-15
04:49:47		 Sala Sismica INGV-Roma 81995551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-15 04:45:21 ± 0.06
Latitude 42.6228 ± 0.0054
Longitude 12.7340 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81995551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 640
Semi-minor axis of confidence ellipse (meter) 354
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34984
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 81995551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-15 04:49:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TOLF.HHZ. 2020-08-15T04:45:35.31 3.0 positive manual P 0 0
IV.NRCA.HHZ. 2020-08-15T04:45:34.98 0.6 undecidable manual S 53 38.8278 50 0.1 48
IV.LNSS.HNN. 2020-08-15T04:45:31.09 0.6 undecidable manual S 95 25.1526 50 -0.13 49
IV.MOMA.HHZ. 2020-08-15T04:45:30.94 0.6 undecidable manual S 326 24.1536 50 -0.01 50
IV.NRCA.HHZ. 2020-08-15T04:45:29.43 0.1 undecidable manual P 53 38.8278 50 0 98
IV.GAVE.EHZ. 2020-08-15T04:45:28.54 0.6 undecidable manual S 59 15.1737 125 0.09 50
IV.LNSS.HNN. 2020-08-15T04:45:27.24 0.1 undecidable manual P 95 25.1526 50 -0.08 99
IV.MOMA.HHZ. 2020-08-15T04:45:27.35 0.3 undecidable manual P 326 24.1536 50 0.18 73
IV.CESX.HHZ. 2020-08-15T04:45:27.29 0.6 undecidable manual S 262 12.0768 132 -0.34 48
IV.ARRO.EHZ. 2020-08-15T04:45:26.27 0.6 undecidable manual S 152 5.4945 153 0.08 51
IV.CESX.HHZ. 2020-08-15T04:45:25.31 0.3 undecidable manual P 262 12.0768 132 0.06 76
IV.GAVE.EHZ. 2020-08-15T04:45:25.53 0.1 undecidable manual P 59 15.1737 125 -0.19 98
IV.ARRO.EHZ. 2020-08-15T04:45:24.61 0.1 negative manual P 152 5.4945 153 0.19 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:0.6 0.00005945 0.64 AML other m 2020-08-15T04:45:27.12
IV.ARRO.EHE. ML:0.4 0.000036049999999999995 0.18 AML other m 2020-08-15T04:45:28.38
IV.GAVE.EHN. ML:0.8 0.00006025 0.46 AML other m 2020-08-15T04:45:29.67
IV.GAVE.EHE. ML:0.7 0.000046399999999999996 0.44 AML other m 2020-08-15T04:45:31.21
IV.MOMA.HHN. ML:0.8 0.000038 0.22 AML other m 2020-08-15T04:45:31.52
IV.MOMA.HHE. ML:0.8 0.00003715 0.52 AML other m 2020-08-15T04:45:31.83
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