Earthquake with magnitude of Md 1.1 on date 20-01-2021 and time 03:58:27 (Italy) in region Campi Flegrei

A magnitude Md 1.1 earthquake occured in region: Campi Flegrei, on

  • 20-01-2021 02:58:27 (UTC)
  • 20-01-2021 03:58:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 40.83, 14.12 at 2 km depth.

The earthquake was located by: Sala Operativa INGV_OV (Napoli).

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
Pozzuoli NA 4 81661 81661
Bacoli NA 5 26560 108221
Quarto NA 6 40930 149151
Monte di Procida NA 7 12886 162037
Marano di Napoli NA 10 59874 221911
Procida NA 11 10530 232441
Calvizzano NA 11 12329 244770
Qualiano NA 11 25702 270472
Napoli NA 11 974074 1244546
Mugnano di Napoli NA 12 34828 1279374
Villaricca NA 12 31122 1310496
Giugliano in Campania NA 13 122974 1433470
Melito di Napoli NA 14 37826 1471296
Parete CE 15 11442 1482738
Casavatore NA 15 18661 1501399
Sant'Antimo NA 15 33905 1535304
Arzano NA 16 34886 1570190
Casandrino NA 16 14336 1584526
Casoria NA 17 77642 1662168
Grumo Nevano NA 17 18061 1680229
Lusciano CE 17 15362 1695591
Trentola-Ducenta CE 17 19429 1715020
Cesa CE 18 8841 1723861
Ischia NA 18 19915 1743776
San Giorgio a Cremano NA 18 45557 1789333
Aversa CE 18 53047 1842380
Frattamaggiore NA 18 30329 1872709
Casapesenna CE 18 6987 1879696
Sant'Arpino CE 18 14307 1894003
San Marcellino CE 19 14155 1908158
Ercolano NA 19 53709 1961867
Succivo CE 19 8457 1970324
Frattaminore NA 19 16208 1986532
Afragola NA 19 65057 2051589
San Cipriano d'Aversa CE 19 13653 2065242
Frignano CE 20 9008 2074250
Portici NA 20 55274 2129524
Crispano NA 20 12354 2141878
Villa di Briano CE 20 7087 2148965
Gricignano di Aversa CE 20 11881 2160846
Volla NA 20 23755 2184601
Cardito NA 20 22755 2207356
Carinaro CE 20 7181 2214537

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km SE of Pozzuoli (81661 inhabitants)
10 Km SW of Marano di Napoli (59874 inhabitants)
11 Km W of Napoli (974074 inhabitants)
13 Km SW of Giugliano in Campania (122974 inhabitants)
17 Km SW of Casoria (77642 inhabitants)
18 Km SW of Aversa (53047 inhabitants)
19 Km W of Ercolano (53709 inhabitants)
19 Km SW of Afragola (65057 inhabitants)
20 Km W of Portici (55274 inhabitants)
21 Km W of Torre del Greco (86275 inhabitants)
25 Km SW of Acerra (59573 inhabitants)
33 Km SW of Caserta (76326 inhabitants)
34 Km W of Castellammare di Stabia (66466 inhabitants)
35 Km W of Scafati (50787 inhabitants)
51 Km W of Cava de' Tirreni (53659 inhabitants)
56 Km W of Salerno (135261 inhabitants)
58 Km W of Avellino (54857 inhabitants)
65 Km SW of Benevento (60091 inhabitants)
77 Km W of Battipaglia (50786 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
Rev200
Md 1.1 2021-01-20
02:58:27
40.83 14.12 2 2021-01-20
03:15:10
Sala Operativa INGV_OV (Napoli) 86388491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 02:58:27
Latitude 40.83
Longitude 14.12
Depth (km) 2 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-OV#WinPick
Event type earthquake
Origin ID 86388491

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 200
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 148
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.05
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitude information

Md:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations
Type of magnitude Md
Reference to an origin 86388491
Agency INGV
Autore Sala Operativa INGV_OV (Napoli)
Time of creation (UTC) 2021-01-20 03:15:10
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