Earthquake with magnitude of ML 1.6 on date 20-10-2020 and time 19:40:04 (Italy) in region 4 km NW Castel Sant'Angelo (RI)

A magnitude ML 1.6 earthquake occured in region: 4 km NW Castel Sant'Angelo (RI), on

  • 20-10-2020 17:40:04 (UTC)
  • 20-10-2020 19:40:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.42, 12.99 at 10 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
Castel Sant'Angelo RI 4 1308 1308
Cittaducale RI 4 6828 8136
Borgo Velino RI 6 972 9108
Micigliano RI 7 127 9235
Antrodoco RI 8 2588 11823
Cantalice RI 9 2755 14578
Concerviano RI 10 291 14869
Rieti RI 10 47698 62567
Poggio Bustone RI 13 2055 64622
Belmonte in Sabina RI 13 636 65258
Petrella Salto RI 15 1197 66455
Posta RI 15 694 67149
Rivodutri RI 16 1253 68402
Longone Sabino RI 16 597 68999
Rocca Sinibalda RI 16 815 69814
Borbona RI 16 617 70431
Leonessa RI 17 2435 72866
Morro Reatino RI 18 373 73239
Contigliano RI 18 3783 77022
Greccio RI 18 1558 78580
Colli sul Velino RI 19 533 79113
Torricella in Sabina RI 20 1342 80455
Monte San Giovanni in Sabina RI 20 714 81169
Varco Sabino RI 20 187 81356
Labro RI 20 374 81730

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SE of Terni (111501 inhabitants)
35 Km W of L'Aquila (69753 inhabitants)
51 Km NE of Guidonia Montecelio (88673 inhabitants)
52 Km NE of Tivoli (56533 inhabitants)
65 Km SE of Foligno (57155 inhabitants)
65 Km W of Teramo (54892 inhabitants)
71 Km NE of Roma (2864731 inhabitants)
72 Km E of Viterbo (67173 inhabitants)
83 Km N of Velletri (53303 inhabitants)
91 Km SE of Perugia (166134 inhabitants)
92 Km NE of Pomezia (62966 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
95 Km N of Aprilia (73446 inhabitants)
96 Km W of Montesilvano (53738 inhabitants)
97 Km W of Chieti (51815 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 1.6 2020-10-20
17:40:04
42.42 12.99 10 2020-10-20
17:51:34
Sala Sismica INGV-Roma 83961191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-20 17:40:04 ± 0.13
Latitude 42.42 ± 0.01
Longitude 12.99 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83961191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 827
Semi-minor axis of confidence ellipse (meter) 414
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 226
Circular confidence region, given by single value of horizontal uncertainty (meter) 830
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 168
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.67179
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 18
Type of magnitude ML
Reference to an origin 83961191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-20 17:51:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CORL.HHZ. 2020-10-20T17:41:27.54 3.0 undecidable manual Pg 12.05 0
GU.RNCA.HHZ. 2020-10-20T17:41:12.06 3.0 undecidable manual Pg 11.25 0
IV.FVI.HHZ. 2020-10-20T17:41:06.76 3.0 negative manual Pn -1.99 0
IV.NDIM.HHZ. 2020-10-20T17:40:59.23 3.0 positive manual Pg 8.07 0
IV.CRTC.HHZ. 2020-10-20T17:40:49.27 3.0 undecidable manual S 0.34 0
IV.BRSN.EHZ. 2020-10-20T17:40:40.12 3.0 negative manual Pg 1.59 0
IV.APEC.HHZ. 2020-10-20T17:40:29.29 3.0 undecidable manual P 1.27 0
IV.ASSB.HHZ. 2020-10-20T17:40:27.86 0.6 undecidable manual S 339 0.6718 50 0.71 38
IV.MF5.EHZ. 2020-10-20T17:40:25.49 3.0 undecidable manual S -3.38 0
IV.MOMA.HHZ. 2020-10-20T17:40:22.41 0.3 undecidable manual S 322 0.4946 50 0.5 65
IV.MGAB.HHZ. 2020-10-20T17:40:20.92 3.0 negative manual P -0.29 0
IV.NRCA.HHZ. 2020-10-20T17:40:19.88 1.0 undecidable manual S 13 0.429 50 -0.07 24
IV.SRES.HHZ. 2020-10-20T17:40:19.81 3.0 undecidable manual S 0
IV.ASSB.HHZ. 2020-10-20T17:40:17.46 0.3 negative manual P 339 0.6718 50 -0.09 68
IV.SMA1.EHZ. 2020-10-20T17:40:17.54 0.3 undecidable manual S 50 0.3354 50 0.36 69
IV.GAVE.EHZ. 2020-10-20T17:40:15.09 0.3 undecidable manual S 346 0.2851 50 -0.61 65
IV.MF5.EHZ. 2020-10-20T17:40:15.57 3.0 undecidable manual P -3.1 0
IV.ARRO.EHZ. 2020-10-20T17:40:14.25 0.1 undecidable manual S 315 0.2311 110 0.33 94
IV.SRES.HHZ. 2020-10-20T17:40:14.46 3.0 undecidable manual P 0
IV.MOMA.HHZ. 2020-10-20T17:40:14.52 0.6 undecidable manual P 322 0.4946 50 0 48
IV.NRCA.HHZ. 2020-10-20T17:40:13.06 0.3 undecidable manual P 13 0.429 50 -0.33 68
IV.RM33.EHZ. 2020-10-20T17:40:12.78 0.3 undecidable manual S 61 0.1925 114 0.25 73
IV.LNSS.HHZ. 2020-10-20T17:40:12.42 0.1 undecidable manual S 12 0.1916 114 -0.09 100
IV.SMA1.EHZ. 2020-10-20T17:40:11.85 0.3 undecidable manual P 50 0.3354 50 0.06 73
IV.FIAM.HHZ. 2020-10-20T17:40:11.66 0.1 undecidable manual S 147 0.1754 116 -0.29 96
IV.GAVE.EHZ. 2020-10-20T17:40:10.38 0.3 undecidable manual P 346 0.2851 50 -0.56 66
IV.RM33.EHZ. 2020-10-20T17:40:09.12 0.3 undecidable manual P 61 0.1925 114 0.01 76
IV.ARRO.EHZ. 2020-10-20T17:40:09.61 0.3 undecidable manual P 315 0.2311 110 -0.3 71
IV.FIAM.HHZ. 2020-10-20T17:40:09.24 0.1 undecidable manual P 147 0.1754 116 0.47 93
IV.LNSS.HHZ. 2020-10-20T17:40:08.88 0.3 undecidable manual P 12 0.1916 114 -0.22 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHE. ML:1.5 0.00023 0.26 AML other m 2020-10-20T17:40:13.61
IV.LNSS.HHE. ML:1.6 0.0002905 1.22 AML other m 2020-10-20T17:40:13.36
IV.RM33.EHN. ML:1.5 0.0001975 0.36 AML other m 2020-10-20T17:40:14.25
IV.LNSS.HHN. ML:1.8 0.0004255 0.56 AML other m 2020-10-20T17:40:15.06
IV.ARRO.EHE. ML:1.4 0.000142 0.74 AML other m 2020-10-20T17:40:15.13
IV.ARRO.EHN. ML:1.4 0.0001345 0.24 AML other m 2020-10-20T17:40:15.31
IV.GAVE.EHE. ML:1.7 0.0002255 0.7 AML other m 2020-10-20T17:40:15.45
IV.GAVE.EHN. ML:1.7 0.0002305 0.56 AML other m 2020-10-20T17:40:17.89
IV.SMA1.EHN. ML:1.4 8.675E-5 0.64 AML other m 2020-10-20T17:40:21.16
IV.NRCA.HHN. ML:1.5 8.555E-5 0.12 AML other m 2020-10-20T17:40:21.95
IV.NRCA.HHE. ML:1.5 8.825E-5 1.42 AML other m 2020-10-20T17:40:23.08
IV.MOMA.HHN. ML:1.7 0.0001275 0.42 AML other m 2020-10-20T17:40:24.23
IV.MOMA.HHE. ML:1.7 0.000116 0.24 AML other m 2020-10-20T17:40:24.15
IV.SMA1.EHE. ML:1.4 0.00010385 0.5 AML other m 2020-10-20T17:40:24.72
IV.ASSB.HHN. ML:1.5 5.23E-5 0.42 AML other m 2020-10-20T17:40:29.36
IV.APEC.HHN. ML:1.6 2.5755E-5 0.2 AML other m 2020-10-20T17:40:29.55
IV.APEC.HHE. ML:1.7 3.02E-5 0.5 AML other m 2020-10-20T17:40:30.59
IV.ASSB.HHE. ML:1.7 6.96E-5 0.44 AML other m 2020-10-20T17:40:31.31
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