Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 19-10-2020 and time 22:08:02 (Italy) in region 8 km W Accumoli (RI)

A magnitude ML 1.0 earthquake occured in region: 8 km W Accumoli (RI), on

  • 19-10-2020 20:08:02 (UTC)
  • 19-10-2020 22:08:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.72, 13.16 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
Accumoli RI 8 667 667
Norcia PG 9 4957 5624
Cittareale RI 12 482 6106
Cascia PG 12 3217 9323
Arquata del Tronto AP 12 1178 10501
Amatrice RI 15 2657 13158
Poggiodomo PG 19 117 13275
Monteleone di Spoleto PG 19 599 13874
Castelsantangelo sul Nera MC 19 281 14155
Montegallo AP 19 523 14678
Preci PG 20 724 15402

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km W of Teramo (54892 inhabitants)
45 Km SE of Foligno (57155 inhabitants)
46 Km E of Terni (111501 inhabitants)
46 Km NW of L'Aquila (69753 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km NE of Tivoli (56533 inhabitants)
91 Km W of Pescara (121014 inhabitants)
92 Km W of Chieti (51815 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.0 2020-10-19
20:08:02		 42.72 13.16 11 2020-10-19
20:12:43		 Sala Sismica INGV-Roma 83917811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-19 20:08:02 ± 0.04
Latitude 42.72 ± 0.00
Longitude 13.16 ± 0.00
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 83917811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 312
Semi-minor axis of confidence ellipse (meter) 225
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 107
Circular confidence region, given by single value of horizontal uncertainty (meter) 310
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
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
Epicentral distance of station farthest from the epicenter (degree) 0.34174
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 83917811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-19 20:12:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRTC.HHZ. 2020-10-19T20:08:37.05 3.0 undecidable manual S -0.37 0
IV.GAVE.EHZ. 2020-10-19T20:08:11.04 0.3 undecidable manual S 261 0.1988 50 -0.17 72
IV.MF5.EHZ. 2020-10-19T20:08:10.45 0.3 undecidable manual P 40 0.3417 50 0.34 68
IV.MC2.EHZ. 2020-10-19T20:08:10.96 0.3 undecidable manual S 6 0.188 50 0.09 74
IV.LNSS.HHZ. 2020-10-19T20:08:09.90 0.3 undecidable manual S 216 0.1511 123 0.14 73
IV.SMA1.EHZ. 2020-10-19T20:08:09.92 0.3 undecidable manual S 126 0.1592 122 -0.09 74
IV.FDMO.HHZ. 2020-10-19T20:08:09.58 0.3 undecidable manual P 350 0.3166 50 -0.09 72
IV.NRCA.HHZ. 2020-10-19T20:08:08.49 0.1 undecidable manual S 342 0.1142 131 -0.13 99
IV.RM33.EHZ. 2020-10-19T20:08:07.91 0.3 undecidable manual P 170 0.2194 50 -0.1 73
IV.GAVE.EHZ. 2020-10-19T20:08:07.71 0.1 undecidable manual P 261 0.1988 50 0.05 99
IV.MMO1.EHZ. 2020-10-19T20:08:07.76 0.1 undecidable manual P 35 0.2122 50 -0.14 97
IV.MC2.EHZ. 2020-10-19T20:08:07.48 0.3 undecidable manual P 6 0.188 50 0.01 75
IV.NRCA.HHZ. 2020-10-19T20:08:06.24 0.1 undecidable manual P 342 0.1142 131 0.07 100
IV.LNSS.HHZ. 2020-10-19T20:08:06.89 0.3 undecidable manual P 216 0.1511 123 0.06 75
IV.SMA1.EHZ. 2020-10-19T20:08:06.94 0.3 undecidable manual P 126 0.1592 122 -0.04 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.0001489584 0.1664 AML other m 2020-10-19T20:08:08.68
IV.NRCA.HHN. ML:1.1 0.00013899935 0.1024 AML other m 2020-10-19T20:08:09.21
IV.NRCA.HNE. ML:1.1 0.00013999952 0.1792 AML other m 2020-10-19T20:08:08.68
IV.NRCA.HNN. ML:1.1 0.000137340495 0.1024 AML other m 2020-10-19T20:08:09.16
IV.LNSS.HHE. ML:1.1 9.9483668E-5 0.1408 AML other m 2020-10-19T20:08:10.14
IV.LNSS.HHN. ML:1.2 0.0001300064 0.1408 AML other m 2020-10-19T20:08:10.22
IV.LNSS.HNE. ML:1.3 0.00016394957 0.2816 AML other m 2020-10-19T20:08:10.28
IV.SMA1.EHE. ML:0.9 5.804446E-5 0.2176 AML other m 2020-10-19T20:08:11.11
IV.SMA1.EHN. ML:0.6 3.587281E-5 0.1792 AML other m 2020-10-19T20:08:11.07
IV.GAVE.EHE. ML:0.7 3.267812E-5 0.2176 AML other m 2020-10-19T20:08:13.44
IV.GAVE.EHN. ML:0.8 4.027944E-5 0.1536 AML other m 2020-10-19T20:08:13.34
IV.RM33.HNN. ML:1.3 0.00010796038 0.6272 AML other m 2020-10-19T20:08:11.17
IV.RM33.EHE. ML:0.9 4.3003355E-5 0.1536 AML other m 2020-10-19T20:08:12.34
IV.RM33.EHN. ML:0.8 3.3990195E-5 0.2176 AML other m 2020-10-19T20:08:12.03
IV.FDMO.HHE. ML:0.4 8.947317E-6 0.2432 AML other m 2020-10-19T20:08:16.17
IV.FDMO.HHN. ML:0.1 6.102497E-6 0.3584 AML other m 2020-10-19T20:08:14.93
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download