Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 23-10-2020 and time 22:13:05 (Italy) in region 3 km E Roccafluvione (AP)

A magnitude ML 1.8 earthquake occured in region: 3 km E Roccafluvione (AP), on

  • 23-10-2020 20:13:05 (UTC)
  • 23-10-2020 22:13:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.85, 13.51 at 20 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
Roccafluvione AP 3 2010 2010
Venarotta AP 4 2066 4076
Ascoli Piceno AP 5 49407 53483
Palmiano AP 7 196 53679
Folignano AP 11 9241 62920
Rotella AP 12 906 63826
Acquasanta Terme AP 12 2916 66742
Force AP 12 1354 68096
Valle Castellana TE 13 977 69073
Castignano AP 13 2796 71869
Appignano del Tronto AP 14 1785 73654
Comunanza AP 14 3166 76820
Montegallo AP 15 523 77343
Montedinove AP 15 488 77831
Maltignano AP 15 2401 80232
Civitella del Tronto TE 16 5116 85348
Montefalcone Appennino FM 16 424 85772
Montemonaco AP 16 604 86376
Castel di Lama AP 17 8634 95010
Montalto delle Marche AP 17 2122 97132
Montefortino FM 17 1178 98310
Sant'Egidio alla Vibrata TE 17 9811 108121
Offida AP 17 5058 113179
Smerillo FM 18 365 113544
Castorano AP 18 2380 115924
Montelparo FM 19 778 116702
Rocca Santa Maria TE 19 537 117239
Santa Vittoria in Matenano FM 19 1330 118569
Ancarano TE 19 1857 120426
Amandola FM 19 3629 124055
Arquata del Tronto AP 20 1178 125233
Colli del Tronto AP 20 3668 128901

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NW of Teramo (54892 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
64 Km NW of Montesilvano (53738 inhabitants)
67 Km E of Foligno (57155 inhabitants)
72 Km NW of Pescara (121014 inhabitants)
78 Km NW of Chieti (51815 inhabitants)
78 Km E of Terni (111501 inhabitants)
85 Km S of Ancona (100861 inhabitants)
96 Km E of Perugia (166134 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 1.8 2020-10-23
20:13:05		 42.85 13.51 20 2020-10-23
20:22:27		 Sala Sismica INGV-Roma 84069591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-23 20:13:05 ± 0.12
Latitude 42.85 ± 0.00
Longitude 13.51 ± 0.01
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84069591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 457
Semi-minor axis of confidence ellipse (meter) 152
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 99
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 53
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.65291
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 18
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 38
Type of magnitude ML
Reference to an origin 84069591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-23 20:22:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CAPR.HNZ. 2020-10-23T20:14:51.83 3.0 undecidable manual Sn 1.66 0
IV.NDIM.HHZ. 2020-10-23T20:14:30.49 3.0 undecidable manual Sg 5.06 0
IV.PLLN.EHZ. 2020-10-23T20:14:29.74 3.0 negative manual Pg 10.03 0
GU.CANO.HHZ. 2020-10-23T20:14:21.25 3.0 undecidable manual Pg 12.88 0
XK.GIZZ.HHZ. 2020-10-23T20:14:19.42 3.0 undecidable manual Pg 6.79 0
IV.FIR.HHZ. 2020-10-23T20:14:09.95 3.0 undecidable manual Sg 5.93 0
IV.PAOL.HHZ. 2020-10-23T20:14:07.27 3.0 undecidable manual Sg 0.58 0
CR.ZAG.BHZ. 2020-10-23T20:13:58.06 3.0 undecidable manual Pn -1.31 0
IV.PTRJ.HHZ. 2020-10-23T20:13:56.08 3.0 undecidable manual Sn -2.88 0
IV.MNTV.HNZ. 2020-10-23T20:13:56.35 3.0 positive manual Pn 2.63 0
IV.MTRZ.HHZ. 2020-10-23T20:13:41.16 3.0 undecidable manual Pn -0.03 0
IV.FIR.HHZ. 2020-10-23T20:13:41.57 3.0 undecidable manual Pg 3.23 0
IV.MMUR.HNZ. 2020-10-23T20:13:21.55 3.0 negative manual P 1.68 0
IV.FDMO.HHZ. 2020-10-23T20:13:19.51 0.6 undecidable manual S 301 0.3606 107 0.21 47
IV.CSP1.EHZ. 2020-10-23T20:13:18.36 0.6 undecidable manual S 317 0.3274 109 0 49
IV.T0110.HHZ. 2020-10-23T20:13:18.24 1.0 negative manual P 163 0.6529 98 -0.27 22
IV.NRCA.HHZ. 2020-10-23T20:13:17.90 0.6 undecidable manual S 266 0.2914 112 0.53 44
IV.MC2.EHZ. 2020-10-23T20:13:16.59 0.6 undecidable manual S 284 0.2428 117 0.53 45
IV.VCEL.EHZ. 2020-10-23T20:13:16.68 0.6 positive manual P 152 0.518 101 0.45 43
IV.MNTT.EHZ. 2020-10-23T20:13:16.08 0.6 undecidable manual S 16 0.2176 120 0.68 43
IV.SMA1.EHZ. 2020-10-23T20:13:16.76 0.6 undecidable manual S 210 0.2572 115 0.32 46
IV.EL6.EHZ. 2020-10-23T20:13:16.68 1.0 negative manual P 328 0.5621 100 -0.29 22
IV.GUMA.HHZ. 2020-10-23T20:13:16.37 0.6 undecidable manual S 328 0.2455 116 0.23 48
IV.TERO.HHZ. 2020-10-23T20:13:15.94 0.6 undecidable manual S 164 0.2401 117 -0.04 50
IV.RM33.EHZ. 2020-10-23T20:13:14.48 0.1 positive manual P 212 0.4074 104 0.1 94
IV.OFFI.HHZ. 2020-10-23T20:13:14.32 0.3 undecidable manual S 57 0.152 132 0.5 69
IV.MMO1.EHZ. 2020-10-23T20:13:13.47 0.6 undecidable manual S 289 0.143 134 -0.16 49
IV.MF5.EHZ. 2020-10-23T20:13:13.33 0.3 undecidable manual S 344 0.1394 135 -0.23 72
IV.FDMO.HHZ. 2020-10-23T20:13:13.40 0.6 negative manual P 301 0.3606 107 -0.2 47
IV.MTRA.EHZ. 2020-10-23T20:13:13.24 0.6 undecidable manual S 221 0.1277 138 -0.08 50
IV.NRCA.HHZ. 2020-10-23T20:13:12.44 0.1 undecidable manual P 266 0.2914 112 -0.05 98
IV.TRTR.HHZ. 2020-10-23T20:13:12.97 1.0 positive manual P 99 0.2986 111 0.37 23
IV.CSP1.EHZ. 2020-10-23T20:13:12.78 0.1 positive manual P 317 0.3274 109 -0.28 93
IV.CAMP.HHZ. 2020-10-23T20:13:12.85 1.0 undecidable manual P 193 0.3256 109 -0.19 24
IV.TERO.HHZ. 2020-10-23T20:13:11.44 0.1 undecidable manual P 164 0.2401 117 -0.25 96
IV.GUMA.HHZ. 2020-10-23T20:13:11.61 0.3 positive manual P 328 0.2455 116 -0.17 72
IV.MC2.EHZ. 2020-10-23T20:13:11.75 0.6 undecidable manual P 284 0.2428 117 0.01 50
IV.MNTT.EHZ. 2020-10-23T20:13:11.30 0.1 undecidable manual P 16 0.2176 120 -0.06 99
IV.SMA1.EHZ. 2020-10-23T20:13:11.92 0.1 positive manual P 210 0.2572 115 -0.03 100
IV.MF5.EHZ. 2020-10-23T20:13:10.02 0.1 undecidable manual P 344 0.1394 135 -0.27 96
IV.MTRA.EHZ. 2020-10-23T20:13:10.03 0.1 positive manual P 221 0.1277 138 -0.12 100
IV.MMO1.EHZ. 2020-10-23T20:13:10.09 1.0 undecidable manual P 289 0.143 134 -0.23 24
IV.OFFI.HHZ. 2020-10-23T20:13:10.35 0.1 undecidable manual P 57 0.152 132 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GUMA.HNN. ML:2.5 0.0014255 0.4 AML other m 2020-10-23T20:13:11.22
IV.MTRA.EHN. ML:1.7 0.0003165 0.5 AML other m 2020-10-23T20:13:13.57
IV.MF5.EHE. ML:1.5 0.000183 0.3 AML other m 2020-10-23T20:13:13.58
IV.MTRA.EHE. ML:2 0.0006165 0.5 AML other m 2020-10-23T20:13:13.56
IV.MTRA.HNE. ML:2 0.000655 0.5 AML other m 2020-10-23T20:13:13.56
IV.MF5.EHN. ML:1.7 0.0003505 0.3 AML other m 2020-10-23T20:13:13.61
IV.MTRA.HNN. ML:1.7 0.000324 0.34 AML other m 2020-10-23T20:13:13.47
IV.OFFI.HHE. ML:1.8 0.0003855 0.48 AML other m 2020-10-23T20:13:14.57
IV.OFFI.HHN. ML:1.8 0.00039 1.56 AML other m 2020-10-23T20:13:15.85
IV.TERO.HNN. ML:1.8 0.0002575 1.68 AML other m 2020-10-23T20:13:15.13
IV.TERO.HHE. ML:1.8 0.000276 0.18 AML other m 2020-10-23T20:13:16.09
IV.TERO.HNE. ML:2 0.000428 1.5 AML other m 2020-10-23T20:13:16.01
IV.MNTT.EHN. ML:2.1 0.000621 0.34 AML other m 2020-10-23T20:13:16.28
IV.GUMA.HHN. ML:1.7 0.0002325 0.48 AML other m 2020-10-23T20:13:16.47
IV.TERO.HHN. ML:1.7 0.0002315 1.22 AML other m 2020-10-23T20:13:16.12
IV.SMA1.EHN. ML:1.7 0.0002225 0.28 AML other m 2020-10-23T20:13:16.98
IV.SMA1.EHE. ML:1.5 0.000148 1.04 AML other m 2020-10-23T20:13:17.07
IV.GUMA.HHE. ML:1.8 0.000271 0.18 AML other m 2020-10-23T20:13:17.89
IV.GUMA.HNE. ML:1.6 0.0001855 0.2 AML other m 2020-10-23T20:13:17.89
IV.MNTT.EHE. ML:2 0.000467 1.8 AML other m 2020-10-23T20:13:18.07
IV.NRCA.HHE. ML:1.9 0.0002915 0.18 AML other m 2020-10-23T20:13:18.09
IV.NRCA.HHN. ML:2 0.000358 0.1 AML other m 2020-10-23T20:13:18.17
IV.CSP1.EHN. ML:1.8 0.0002415 0.5 AML other m 2020-10-23T20:13:18.74
IV.CSP1.EHE. ML:1.8 0.000197 0.2 AML other m 2020-10-23T20:13:18.71
IV.FDMO.HHE. ML:1.3 6.32E-5 0.52 AML other m 2020-10-23T20:13:19.78
IV.FDMO.HHN. ML:1.3 5.855E-5 0.7 AML other m 2020-10-23T20:13:19.61
IV.CAMP.HHE. ML:0.9 2.575E-5 0.42 AML other m 2020-10-23T20:13:20.21
IV.RM33.EHN. ML:1.4 7.225E-5 0.22 AML other m 2020-10-23T20:13:21.61
IV.RM33.EHE. ML:1.5 8.04E-5 0.78 AML other m 2020-10-23T20:13:22.86
IV.CAMP.HHN. ML:1.1 4.375E-5 0.4 AML other m 2020-10-23T20:13:23.22
IV.TRTR.HHN. ML:1.9 0.000294 0.74 AML other m 2020-10-23T20:13:25.51
IV.VCEL.EHN. ML:1.3 4.59E-5 0.54 AML other m 2020-10-23T20:13:25.61
IV.TRTR.HHE. ML:1.9 0.0002755 1.6 AML other m 2020-10-23T20:13:26.13
IV.VCEL.EHE. ML:1.3 4.565E-5 1.16 AML other m 2020-10-23T20:13:27.63
IV.MMUR.HNN. ML:2.1 0.0001905 0.42 AML other m 2020-10-23T20:13:28.36
IV.MMUR.HNE. ML:2.1 0.0001755 0.4 AML other m 2020-10-23T20:13:52.25
IV.CAPR.HNN. ML:3.5 0.0001765 1.36 AML other m 2020-10-23T20:14:59.22
IV.CAPR.HNE. ML:3.5 0.00016315 1.4 AML other m 2020-10-23T20:14:59.96
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