Earthquake with magnitude of ML 1.0 on date 23-09-2020 and time 23:33:15 (Italy) in region 3 km E Roccafluvione (AP)

A magnitude ML 1.0 earthquake occured in region: 3 km E Roccafluvione (AP), on

  • 23-09-2020 21:33:15 (UTC)
  • 23-09-2020 23:33:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.85, 13.5 at 17 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
Roccafluvione AP 3 2010 2010
Venarotta AP 3 2066 4076
Ascoli Piceno AP 6 49407 53483
Palmiano AP 6 196 53679
Folignano AP 11 9241 62920
Acquasanta Terme AP 12 2916 65836
Rotella AP 12 906 66742
Force AP 12 1354 68096
Valle Castellana TE 13 977 69073
Castignano AP 14 2796 71869
Comunanza AP 14 3166 75035
Montegallo AP 14 523 75558
Appignano del Tronto AP 14 1785 77343
Montedinove AP 15 488 77831
Maltignano AP 15 2401 80232
Montemonaco AP 15 604 80836
Montefalcone Appennino FM 15 424 81260
Civitella del Tronto TE 16 5116 86376
Montefortino FM 17 1178 87554
Castel di Lama AP 17 8634 96188
Montalto delle Marche AP 17 2122 98310
Smerillo FM 18 365 98675
Sant'Egidio alla Vibrata TE 18 9811 108486
Offida AP 18 5058 113544
Montelparo FM 19 778 114322
Santa Vittoria in Matenano FM 19 1330 115652
Amandola FM 19 3629 119281
Rocca Santa Maria TE 19 537 119818
Castorano AP 19 2380 122198
Arquata del Tronto AP 19 1178 123376
Ancarano TE 19 1857 125233

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NW of Teramo (54892 inhabitants)
56 Km N of L'Aquila (69753 inhabitants)
65 Km NW of Montesilvano (53738 inhabitants)
66 Km E of Foligno (57155 inhabitants)
72 Km NW of Pescara (121014 inhabitants)
77 Km E of Terni (111501 inhabitants)
78 Km NW of Chieti (51815 inhabitants)
85 Km S of Ancona (100861 inhabitants)
95 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 1.0 2020-09-23
21:33:15
42.85 13.5 17 2020-09-23
21:46:49
Sala Sismica INGV-Roma 83170271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-23 21:33:15 ± 0.08
Latitude 42.85 ± 0.00
Longitude 13.50 ± 0.01
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83170271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 530
Semi-minor axis of confidence ellipse (meter) 146
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
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) 144
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.12501
Epicentral distance of station farthest from the epicenter (degree) 0.35613
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 83170271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-23 21:46:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2020-09-23T21:33:29.22 0.6 undecidable manual S 301 0.3561 103 0.04 47
IV.TERO.HHZ. 2020-09-23T21:33:26.07 0.6 undecidable manual S 162 0.2419 112 0.11 48
IV.MC2.EHZ. 2020-09-23T21:33:26.02 0.6 undecidable manual S 284 0.2383 112 0.17 47
IV.SMA1.EHZ. 2020-09-23T21:33:26.35 0.6 undecidable manual S 209 0.2554 110 0.02 48
IV.MNTT.EHZ. 2020-09-23T21:33:25.74 0.6 undecidable manual S 18 0.2185 115 0.43 45
IV.MMO1.EHZ. 2020-09-23T21:33:23.11 0.6 undecidable manual S 289 0.1376 130 -0.19 48
IV.FDMO.HHZ. 2020-09-23T21:33:23.33 1.0 negative manual P 301 0.3561 103 -0.28 23
IV.MTRA.EHZ. 2020-09-23T21:33:23.19 0.6 undecidable manual S 219 0.125 134 0.16 48
IV.MF5.EHZ. 2020-09-23T21:33:23.16 0.6 undecidable manual S 346 0.1376 130 -0.14 48
IV.SMA1.EHZ. 2020-09-23T21:33:21.97 0.1 positive manual P 209 0.2554 110 0 97
IV.MNTT.EHZ. 2020-09-23T21:33:21.37 0.3 positive manual P 18 0.2185 115 -0.01 73
IV.TERO.HHZ. 2020-09-23T21:33:21.56 0.6 undecidable manual P 162 0.2419 112 -0.19 47
IV.MC2.EHZ. 2020-09-23T21:33:21.70 1.0 undecidable manual P 284 0.2383 112 0.01 24
IV.MF5.EHZ. 2020-09-23T21:33:20.04 0.6 negative manual P 346 0.1376 130 -0.17 48
IV.MMO1.EHZ. 2020-09-23T21:33:20.03 1.0 undecidable manual P 289 0.1376 130 -0.18 24
IV.MTRA.EHZ. 2020-09-23T21:33:20.03 0.1 positive manual P 219 0.125 134 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TERO.HHE. ML:0.8 3.025E-5 0.62 AML other m 2020-09-23T21:33:26.42
IV.TERO.HHN. ML:0.7 2.57E-5 0.72 AML other m 2020-09-23T21:33:26.21
IV.SMA1.EHE. ML:1.2 6.3E-5 1.06 AML other m 2020-09-23T21:33:27.11
IV.SMA1.EHN. ML:1.2 7.415E-5 0.12 AML other m 2020-09-23T21:33:27.21
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