Earthquake with magnitude of ML 1.0 on date 22-10-2020 and time 00:17:08 (Italy) in region 8 km W Arquata del Tronto (AP)

A magnitude ML 1.0 earthquake occured in region: 8 km W Arquata del Tronto (AP), on

  • 21-10-2020 22:17:08 (UTC)
  • 22-10-2020 00:17:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.78, 13.2 at 6 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Norcia PG 8 4957 4957
Arquata del Tronto AP 8 1178 6135
Accumoli RI 10 667 6802
Montegallo AP 14 523 7325
Castelsantangelo sul Nera MC 14 281 7606
Cascia PG 16 3217 10823
Preci PG 17 724 11547
Montemonaco AP 18 604 12151
Acquasanta Terme AP 18 2916 15067
Cittareale RI 18 482 15549
Amatrice RI 18 2657 18206
Ussita MC 19 444 18650
Visso MC 19 1107 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
50 Km NW of L'Aquila (69753 inhabitants)
51 Km E of Terni (111501 inhabitants)
75 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
94 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
97 Km S of Ancona (100861 inhabitants)
98 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 2020-10-21
22:17:08
42.78 13.19 6 2020-10-21
22:25:24
Sala Sismica INGV-Roma 84004821
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-21 22:17:08 ± 0.11
Latitude 42.78 ± 0.00
Longitude 13.19 ± 0.01
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84004821

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 478
Semi-minor axis of confidence ellipse (meter) 106
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 480
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.40919
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 84004821
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-21 22:25:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MNTT.EHZ. 2020-10-21T22:17:18.02 0.3 undecidable manual P 46 0.4092 50 0.47 86
IV.GAVE.EHZ. 2020-10-21T22:17:18.00 0.6 undecidable manual S 249 0.2365 104 0.09 64
IV.FDMO.HHZ. 2020-10-21T22:17:18.98 0.6 undecidable manual S 343 0.2716 102 -0.24 62
IV.LNSS.HHZ. 2020-10-21T22:17:17.04 0.6 undecidable manual S 213 0.2077 105 0.2 63
IV.SMA1.EHZ. 2020-10-21T22:17:15.09 0.6 undecidable manual S 145 0.179 108 -0.69 55
IV.MF5.EHZ. 2020-10-21T22:17:15.03 0.3 undecidable manual P 43 0.2869 101 0 97
IV.MC2.EHZ. 2020-10-21T22:17:15.08 0.6 undecidable manual S 358 0.1349 113 0.9 51
IV.T1299.EHZ. 2020-10-21T22:17:15.57 0.6 undecidable manual S 156 0.1565 110 0.62 57
IV.CSP1.EHZ. 2020-10-21T22:17:15.09 0.3 undecidable manual P 1 0.3148 100 -0.56 85
IV.FDMO.HHZ. 2020-10-21T22:17:14.40 0.3 undecidable manual P 343 0.2716 102 -0.31 92
IV.RM33.EHZ. 2020-10-21T22:17:14.51 0.3 undecidable manual P 177 0.268 102 -0.13 95
IV.MMO1.EHZ. 2020-10-21T22:17:14.94 0.6 undecidable manual S 38 0.1556 110 -0.01 66
IV.MTRA.HNZ. 2020-10-21T22:17:14.63 0.6 undecidable manual S 98 0.1493 111 -0.07 66
IV.LNSS.HHZ. 2020-10-21T22:17:13.27 0.3 undecidable manual P 213 0.2077 105 -0.06 98
IV.GAVE.EHZ. 2020-10-21T22:17:13.77 0.3 undecidable manual P 249 0.2365 104 -0.18 95
IV.MMO1.EHZ. 2020-10-21T22:17:12.08 0.3 undecidable manual P 38 0.1556 110 -0.16 97
IV.MTRA.HNZ. 2020-10-21T22:17:12.18 0.6 undecidable manual P 98 0.1493 111 0.08 65
IV.NRCA.HHZ. 2020-10-21T22:17:12.45 0.3 undecidable manual S 314 0.0818 125 0.06 100
IV.SMA1.EHZ. 2020-10-21T22:17:12.65 0.3 undecidable manual P 145 0.179 108 -0.07 98
IV.T1299.EHZ. 2020-10-21T22:17:12.46 0.3 undecidable manual P 156 0.1565 110 0.22 95
IV.MC2.EHZ. 2020-10-21T22:17:11.99 0.3 undecidable manual P 358 0.1349 113 0.2 96
IV.NRCA.HHZ. 2020-10-21T22:17:10.82 0.3 undecidable manual P 314 0.0818 125 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.2 0.0002742775 0.0896 AML other m 2020-10-21T22:17:12.93
IV.NRCA.HHN. ML:1.1 0.00019764555 0.128 AML other m 2020-10-21T22:17:13.15
IV.NRCA.HNE. ML:1.2 0.00023869275 0.0768 AML other m 2020-10-21T22:17:12.93
IV.NRCA.HNN. ML:1 0.000183606 0.1024 AML other m 2020-10-21T22:17:13.21
IV.SMA1.EHN. ML:0.6 2.967472E-5 0.256 AML other m 2020-10-21T22:17:15.81
IV.LNSS.HNE. ML:1.1 9.149899E-5 0.4096 AML other m 2020-10-21T22:17:17.08
IV.LNSS.HHE. ML:1 6.288059E-5 0.1536 AML other m 2020-10-21T22:17:18.19
IV.LNSS.HHN. ML:1 6.8614135E-5 0.1792 AML other m 2020-10-21T22:17:17.62
IV.GAVE.EHE. ML:1 6.1243805E-5 0.1408 AML other m 2020-10-21T22:17:19.35
IV.GAVE.EHN. ML:1 6.091671E-5 0.1408 AML other m 2020-10-21T22:17:18.63
IV.FDMO.HHE. ML:0.5 1.6795915E-5 0.2048 AML other m 2020-10-21T22:17:19.16
IV.FDMO.HHN. ML:0.6 2.0012705E-5 0.2048 AML other m 2020-10-21T22:17:19.16
IV.RM33.EHE. ML:0.8 3.056253E-5 0.1408 AML other m 2020-10-21T22:17:20.49
IV.RM33.EHN. ML:0.9 4.0075625E-5 0.192 AML other m 2020-10-21T22:17:19.11
IV.CSP1.EHE. ML:1 4.581459E-5 0.384 AML other m 2020-10-21T22:17:22.73
IV.CSP1.EHN. ML:1.2 5.947875E-5 0.1792 AML other m 2020-10-21T22:17:21.36
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download