Earthquake with magnitude of ML 1.2 on date 21-10-2018 and time 08:45:23 (Italy) in region 5 km S Arquata del Tronto (AP)

A magnitude ML 1.2 earthquake occured in region: 5 km S Arquata del Tronto (AP), on

  • 21-10-2018 06:45:23 (UTC)
  • 21-10-2018 08:45:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.73, 13.28 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
Arquata del Tronto AP 5 1178 1178
Accumoli RI 5 667 1845
Acquasanta Terme AP 11 2916 4761
Amatrice RI 12 2657 7418
Montegallo AP 13 523 7941
Cittareale RI 16 482 8423
Norcia PG 17 4957 13380
Valle Castellana TE 18 977 14357
Montemonaco AP 19 604 14961

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km W of Teramo (54892 inhabitants)
44 Km N of L'Aquila (69753 inhabitants)
53 Km E of Foligno (57155 inhabitants)
55 Km E of Terni (111501 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
82 Km W of Pescara (121014 inhabitants)
84 Km SE of Perugia (166134 inhabitants)
84 Km NW of Chieti (51815 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km NE of Tivoli (56533 inhabitants)
100 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
Rev 100 ML 1.2 2018-10-21
06:45:23
42.73 13.28 13 2018-10-21
06:55:32
Sala Sismica INGV-Roma 62161871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-10-21 06:45:23 ± 0.07
Latitude 42.73 ± 0.00
Longitude 13.28 ± 0.00
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 62161871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 329
Semi-minor axis of confidence ellipse (meter) 63
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) 330
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
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) 0.11062
Epicentral distance of station farthest from the epicenter (degree) 0.36243
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 62161871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-10-21 06:55:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2018-10-21T06:45:34.03 0.3 undecidable manual S 115 0.2608 98 -0.05 74
IV.LNSS.HHN. 2018-10-21T06:45:33.05 0.6 undecidable manual S 234 0.2212 101 0.12 48
IV.RM33.EHE. 2018-10-21T06:45:33.18 0.6 undecidable manual S 193 0.2302 100 -0.02 49
IV.CAMP.HHE. 2018-10-21T06:45:32.66 0.6 undecidable manual S 155 0.2185 101 -0.19 48
IV.MC2.EHZ. 2018-10-21T06:45:32.29 0.6 undecidable manual S 339 0.1907 104 0.25 48
IV.MMO1.EHZ. 2018-10-21T06:45:31.44 0.3 undecidable manual S 11 0.1682 108 0.03 75
IV.CSP1.EHZ. 2018-10-21T06:45:31.49 0.6 undecidable manual P 351 0.3624 95 0 48
IV.GAVE.EHE. 2018-10-21T06:45:30.12 0.6 undecidable manual P 262 0.2887 97 -0.12 48
IV.NRCA.HHZ. 2018-10-21T06:45:30.78 0.3 undecidable manual S 309 0.1592 110 -0.36 70
IV.RM33.EHE. 2018-10-21T06:45:29.30 0.3 undecidable manual P 193 0.2302 100 0.05 73
IV.SMA1.EHZ. 2018-10-21T06:45:29.76 0.3 undecidable manual S 160 0.1106 125 -0.1 75
IV.TERO.HHZ. 2018-10-21T06:45:29.68 0.1 undecidable manual P 115 0.2608 98 -0.08 98
IV.CAMP.HHE. 2018-10-21T06:45:29.08 0.3 undecidable manual P 155 0.2185 101 0.03 74
IV.LNSS.HHN. 2018-10-21T06:45:29.04 0.6 undecidable manual P 234 0.2212 101 -0.06 50
IV.NRCA.HHZ. 2018-10-21T06:45:28.03 0.1 negative manual P 309 0.1592 110 -0.04 100
IV.MC2.EHZ. 2018-10-21T06:45:28.75 1.0 positive manual P 339 0.1907 104 0.17 24
IV.MMO1.EHZ. 2018-10-21T06:45:28.35 0.6 undecidable manual P 11 0.1682 108 0.13 49
IV.SMA1.EHZ. 2018-10-21T06:45:27.57 0.1 undecidable manual P 160 0.1106 125 0.25 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.9 7.995E-5 0.18 AML other m 2018-10-21T06:45:29.90
IV.SMA1.EHE. ML:0.8 6.6530195E-5 0.0992 AML other m 2018-10-21T06:45:30.09
IV.NRCA.HNE. ML:1.4 0.00017840641 0.16 AML other m 2018-10-21T06:45:30.96
IV.NRCA.HHE. ML:1.4 0.00016885045 0.1216 AML other m 2018-10-21T06:45:31.01
IV.NRCA.HNN. ML:1.4 0.0002051353 0.9504 AML other m 2018-10-21T06:45:30.53
IV.NRCA.HHN. ML:1.2 0.000109635745 0.1408 AML other m 2018-10-21T06:45:30.00
IV.TERO.HHN. ML:0.6 2.105185E-5 0.48 AML other m 2018-10-21T06:45:34.83
IV.TERO.HHE. ML:0.5 1.2531858E-5 0.1184 AML other m 2018-10-21T06:45:34.19
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