Earthquake with magnitude of ML 1.1 on date 20-08-2020 and time 03:27:06 (UTC) in region 4 km W Posta (RI)

A magnitude ML 1.1 earthquake occured in region: 4 km W Posta (RI), on

  • 20-08-2020 03:27:06 (UTC)
  • 20-08-2020 05:27:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.53, 13.05 at 13 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
Posta RI 4 694 694
Borbona RI 7 617 1311
Leonessa RI 8 2435 3746
Micigliano RI 9 127 3873
Antrodoco RI 13 2588 6461
Cittareale RI 13 482 6943
Poggio Bustone RI 14 2055 8998
Cantalice RI 14 2755 11753
Borgo Velino RI 14 972 12725
Castel Sant'Angelo RI 15 1308 14033
Monteleone di Spoleto PG 15 599 14632
Rivodutri RI 16 1253 15885
Montereale AQ 16 2581 18466
Cagnano Amiterno AQ 17 1369 19835
Morro Reatino RI 18 373 20208
Polino TR 18 233 20441
Cittaducale RI 18 6828 27269

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Terni (111501 inhabitants)
35 Km NW of L'Aquila (69753 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
56 Km W of Teramo (54892 inhabitants)
65 Km NE of Guidonia Montecelio (88673 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
78 Km E of Viterbo (67173 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
85 Km NE of Roma (2864731 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
94 Km W of Chieti (51815 inhabitants)
96 Km W of Pescara (121014 inhabitants)
97 Km N of Velletri (53303 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 1.1 2020-08-20
03:27:06
42.53 13.05 13 2020-08-20
03:32:02
Sala Sismica INGV-Roma 82165421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-20 03:27:06 ± 0.09
Latitude 42.53 ± 0.00
Longitude 13.05 ± 0.01
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82165421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 476
Semi-minor axis of confidence ellipse (meter) 142
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 45
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) 114
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.58456
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 82165421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-20 03:32:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2020-08-20T03:27:30.47 3.0 undecidable manual S -0.21 0
IV.ASSB.HHZ. 2020-08-20T03:27:26.46 0.6 undecidable manual S 331 0.5846 92 0.4 43
IV.FDMO.HHZ. 2020-08-20T03:27:24.10 0.6 undecidable manual S 3 0.5045 93 0.41 44
IV.MMO1.EHZ. 2020-08-20T03:27:21.37 0.6 undecidable manual S 29 0.4191 93 0.19 47
IV.MC2.EHZ. 2020-08-20T03:27:20.80 0.3 undecidable manual S 15 0.3921 94 0.43 67
IV.TERO.HHZ. 2020-08-20T03:27:20.92 0.6 undecidable manual S 77 0.4182 93 -0.23 46
IV.ASSB.HHZ. 2020-08-20T03:27:17.65 1.0 undecidable manual P 331 0.5846 92 -0.05 23
IV.NRCA.HHZ. 2020-08-20T03:27:17.32 0.6 undecidable manual S 9 0.304 96 -0.46 44
IV.FDMO.HHZ. 2020-08-20T03:27:16.23 1.0 undecidable manual P 3 0.5045 93 -0.1 23
IV.FIAM.HHZ. 2020-08-20T03:27:16.91 0.6 undecidable manual S 169 0.2698 97 0.16 48
IV.ARRO.EHZ. 2020-08-20T03:27:15.63 0.6 undecidable manual S 283 0.2131 100 0.52 45
IV.SMA1.EHZ. 2020-08-20T03:27:15.77 0.6 undecidable manual S 65 0.232 99 0.11 49
IV.MC2.EHZ. 2020-08-20T03:27:14.54 1.0 undecidable manual P 15 0.3921 94 0.12 24
IV.TERO.HHZ. 2020-08-20T03:27:14.67 0.3 negative manual P 77 0.4182 93 -0.19 70
IV.GAVE.EHZ. 2020-08-20T03:27:14.17 0.6 undecidable manual S 325 0.1952 102 -0.42 46
IV.MMO1.EHZ. 2020-08-20T03:27:14.75 0.6 undecidable manual P 29 0.4191 93 -0.13 47
IV.NRCA.HHZ. 2020-08-20T03:27:12.60 0.1 positive manual P 9 0.304 96 -0.32 92
IV.RM33.EHZ. 2020-08-20T03:27:12.65 0.6 undecidable manual S 101 0.1241 119 0.04 51
IV.FIAM.HHZ. 2020-08-20T03:27:12.23 1.0 negative manual P 169 0.2698 97 -0.1 25
IV.LNSS.HHZ. 2020-08-20T03:27:11.23 0.6 undecidable manual S 355 0.0701 141 -0.14 50
IV.ARRO.EHZ. 2020-08-20T03:27:11.22 0.6 undecidable manual P 283 0.2131 100 -0.16 49
IV.SMA1.EHZ. 2020-08-20T03:27:11.81 0.3 negative manual P 65 0.232 99 0.11 74
IV.GAVE.EHZ. 2020-08-20T03:27:10.87 0.6 positive manual P 325 0.1952 102 -0.21 48
IV.RM33.EHZ. 2020-08-20T03:27:10.03 0.1 negative manual P 101 0.1241 119 0.1 100
IV.LNSS.HHZ. 2020-08-20T03:27:09.19 1.0 undecidable manual P 355 0.0701 141 -0.03 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.6 0.000503 0.14 AML other m 2020-08-20T03:27:11.32
IV.LNSS.HHN. ML:1.6 0.0004315 0.34 AML other m 2020-08-20T03:27:11.26
IV.RM33.EHN. ML:1.2 0.0001305 0.52 AML other m 2020-08-20T03:27:12.68
IV.RM33.EHE. ML:1.4 0.000255 0.28 AML other m 2020-08-20T03:27:12.84
IV.GAVE.EHN. ML:1.2 9.395E-5 0.48 AML other m 2020-08-20T03:27:14.46
IV.ARRO.EHN. ML:0.8 3.32E-5 0.18 AML other m 2020-08-20T03:27:15.71
IV.SMA1.EHN. ML:1.3 0.00011205 0.58 AML other m 2020-08-20T03:27:16.14
IV.GAVE.EHE. ML:1 7.215E-5 0.46 AML other m 2020-08-20T03:27:16.09
IV.SMA1.EHE. ML:1.3 0.00010075 0.46 AML other m 2020-08-20T03:27:16.55
IV.FIAM.HHN. ML:0.5 1.475E-5 0.86 AML other m 2020-08-20T03:27:17.52
IV.NRCA.HHE. ML:1.4 9.145E-5 0.12 AML other m 2020-08-20T03:27:17.67
IV.FIAM.HHE. ML:0.5 1.4405E-5 1.58 AML other m 2020-08-20T03:27:17.79
IV.ARRO.EHE. ML:0.5 2.2E-5 1.34 AML other m 2020-08-20T03:27:17.97
IV.NRCA.HHN. ML:1.3 7.95E-5 0.12 AML other m 2020-08-20T03:27:18.18
IV.TERO.HHE. ML:0.8 2.055E-5 0.22 AML other m 2020-08-20T03:27:21.09
IV.TERO.HHN. ML:1 2.37E-5 1.02 AML other m 2020-08-20T03:27:21.15
IV.FDMO.HHE. ML:0.8 1.2905E-5 1.44 AML other m 2020-08-20T03:27:24.94
IV.FDMO.HHN. ML:0.6 1.193E-5 1 AML other m 2020-08-20T03:27:24.44
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download