Earthquake with magnitude of ML 1.0 on date 23-08-2020 and time 04:59:27 (UTC) in region 3 km SW Arquata del Tronto (AP)

A magnitude ML 1.0 earthquake occured in region: 3 km SW Arquata del Tronto (AP), on

  • 23-08-2020 04:59:27 (UTC)
  • 23-08-2020 06:59:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.75, 13.27 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Arquata del Tronto AP 3 1178 1178
Accumoli RI 6 667 1845
Acquasanta Terme AP 12 2916 4761
Montegallo AP 12 523 5284
Amatrice RI 13 2657 7941
Norcia PG 15 4957 12898
Cittareale RI 17 482 13380
Montemonaco AP 17 604 13984
Valle Castellana TE 19 977 14961
Castelsantangelo sul Nera MC 19 281 15242

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Teramo (54892 inhabitants)
45 Km N of L'Aquila (69753 inhabitants)
52 Km E of Foligno (57155 inhabitants)
55 Km E of Terni (111501 inhabitants)
76 Km W of Montesilvano (53738 inhabitants)
82 Km E of Perugia (166134 inhabitants)
83 Km W of Pescara (121014 inhabitants)
86 Km NW of Chieti (51815 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km NE of Tivoli (56533 inhabitants)
99 Km S of Ancona (100861 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 2020-08-23
04:59:27
42.75 13.27 11 2020-08-23
05:04:45
Sala Sismica INGV-Roma 82249131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-23 04:59:27 ± 0.06
Latitude 42.75 ± 0.00
Longitude 13.27 ± 0.01
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 82249131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 528
Semi-minor axis of confidence ellipse (meter) 319
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 89
Circular confidence region, given by single value of horizontal uncertainty (meter) 530
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 55
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 82249131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-23 05:04:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2020-08-23T05:00:07.56 3.0 undecidable manual S 0.22 0
IV.EL6.EHZ. 2020-08-23T04:59:49.07 0.6 undecidable manual S 348 0.5927 50 1.38 28
IV.CSP1.EHZ. 2020-08-23T04:59:40.13 0.6 undecidable manual S 352 0.3453 50 -0.24 46
IV.EL6.EHZ. 2020-08-23T04:59:39.26 1.0 positive manual P 348 0.5927 50 0.04 23
IV.FDMO.HHZ. 2020-08-23T04:59:39.29 0.6 undecidable manual S 335 0.3175 50 -0.24 46
IV.MF5.EHZ. 2020-08-23T04:59:38.94 0.6 undecidable manual S 30 0.2752 50 0.67 41
IV.GAVE.EHZ. 2020-08-23T04:59:38.69 0.6 undecidable manual S 258 0.2833 50 0.16 47
IV.RM33.EHZ. 2020-08-23T04:59:37.42 0.6 undecidable manual S 190 0.2437 50 0.06 49
IV.TERO.HHZ. 2020-08-23T04:59:37.89 0.6 undecidable manual S 117 0.2743 50 -0.37 45
IV.LNSS.HHE. 2020-08-23T04:59:36.90 0.6 undecidable manual S 229 0.2248 50 0.11 49
IV.MC2.EHZ. 2020-08-23T04:59:35.63 0.6 undecidable manual S 339 0.1727 50 0.37 46
IV.MMO1.EHZ. 2020-08-23T04:59:34.50 0.6 undecidable manual S 15 0.1547 122 -0.22 48
IV.CSP1.EHZ. 2020-08-23T04:59:34.57 1.0 positive manual P 352 0.3453 50 -0.42 22
IV.GAVE.EHZ. 2020-08-23T04:59:34.09 0.6 negative manual P 258 0.2833 50 0.16 47
IV.NRCA.HHZ. 2020-08-23T04:59:34.23 0.6 undecidable manual S 306 0.143 125 -0.11 49
IV.FDMO.HHZ. 2020-08-23T04:59:34.14 0.6 undecidable manual P 335 0.3175 50 -0.37 45
IV.TERO.HHZ. 2020-08-23T04:59:33.22 1.0 undecidable manual P 117 0.2743 50 -0.55 22
IV.MF5.EHZ. 2020-08-23T04:59:33.70 1.0 undecidable manual P 30 0.2752 50 -0.08 24
IV.SMA1.EHZ. 2020-08-23T04:59:33.89 0.6 undecidable manual S 159 0.1277 128 0.04 50
IV.RM33.EHZ. 2020-08-23T04:59:33.09 0.3 positive manual P 190 0.2437 50 -0.16 72
IV.T1299.EHE. 2020-08-23T04:59:33.94 0.6 undecidable manual S 176 0.1151 131 0.45 46
IV.MTRA.EHZ. 2020-08-23T04:59:32.88 0.6 undecidable manual S 85 0.0917 137 0.06 50
IV.LNSS.HHE. 2020-08-23T04:59:32.60 0.1 undecidable manual P 229 0.2248 50 -0.32 93
IV.MC2.EHZ. 2020-08-23T04:59:32.05 0.6 negative manual P 339 0.1727 50 0.01 50
IV.NRCA.HHZ. 2020-08-23T04:59:31.41 0.1 negative manual P 306 0.143 125 -0.1 99
IV.T1299.EHE. 2020-08-23T04:59:31.21 0.1 undecidable manual P 176 0.1151 131 0.19 97
IV.MMO1.EHZ. 2020-08-23T04:59:31.59 0.1 positive manual P 15 0.1547 122 -0.14 98
IV.SMA1.EHZ. 2020-08-23T04:59:31.28 0.1 positive manual P 159 0.1277 128 0.05 100
IV.MTRA.EHZ. 2020-08-23T04:59:30.69 0.6 undecidable manual P 85 0.0917 137 0.06 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1 0.000127 0.38 AML other m 2020-08-23T04:59:33.00
IV.MTRA.EHN. ML:0.8 8.645E-5 0.42 AML other m 2020-08-23T04:59:33.29
IV.SMA1.EHN. ML:0.9 6.85E-5 0.7 AML other m 2020-08-23T04:59:34.02
IV.SMA1.EHE. ML:1 0.000103 0.2 AML other m 2020-08-23T04:59:34.11
IV.NRCA.HHN. ML:1.1 0.0001135 0.86 AML other m 2020-08-23T04:59:34.32
IV.NRCA.HHE. ML:1.1 0.0001205 0.14 AML other m 2020-08-23T04:59:34.41
IV.TERO.HHE. ML:0.9 3.56E-5 0.9 AML other m 2020-08-23T04:59:38.02
IV.TERO.HHN. ML:1 4.695E-5 0.08 AML other m 2020-08-23T04:59:38.88
IV.GAVE.EHN. ML:1 4.73E-5 0.28 AML other m 2020-08-23T04:59:38.80
IV.GAVE.EHE. ML:1 4.505E-5 1.12 AML other m 2020-08-23T04:59:39.10
IV.FDMO.HHN. ML:0.9 3.21E-5 0.2 AML other m 2020-08-23T04:59:39.53
IV.FDMO.HHE. ML:0.7 1.925E-5 0.64 AML other m 2020-08-23T04:59:40.43
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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