Earthquake with magnitude of Md 4.1 on date 23-01-1985 and time 11:10:18 (Italy) in region 7 km W Abetone (PT)

A magnitude Md 4.1 earthquake occured in region: 7 km W Abetone (PT), on

  • 23-01-1985 10:10:18 (UTC)
  • 23-01-1985 11:10:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1400, 10.5740 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Abetone PT 7 621 621
Fiumalbo MO 7 1280 1901
Pievepelago MO 8 2222 4123
Coreglia Antelminelli LU 9 5215 9338
Fosciandora LU 10 602 9940
Barga LU 10 10034 19974
Riolunato MO 12 712 20686
Pieve Fosciana LU 13 2414 23100
Castiglione di Garfagnana LU 13 1818 24918
Castelnuovo di Garfagnana LU 13 5950 30868
Gallicano LU 14 3807 34675
Villa Collemandina LU 14 1334 36009
Molazzana LU 14 1043 37052
Bagni di Lucca LU 14 6161 43213
Cutigliano PT 15 1488 44701
Montecreto MO 17 940 45641
Frassinoro MO 17 1926 47567
Borgo a Mozzano LU 18 6994 54561
Fabbriche di Vergemoli LU 18 768 55329
San Romano in Garfagnana LU 19 1410 56739
Sestola MO 19 2508 59247
Camporgiano LU 19 2176 61423
Fanano MO 19 2989 64412
San Marcello Pistoiese PT 20 6416 70828
Piteglio PT 20 1683 72511
Careggine LU 20 564 73075

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km N of Lucca (89046 inhabitants)
36 Km NW of Pistoia (90315 inhabitants)
36 Km E of Massa (69479 inhabitants)
39 Km E of Carrara (63133 inhabitants)
40 Km NE of Viareggio (62467 inhabitants)
49 Km N of Pisa (89158 inhabitants)
51 Km NW of Prato (191150 inhabitants)
60 Km E of La Spezia (93959 inhabitants)
62 Km S of Reggio nell'Emilia (171345 inhabitants)
63 Km SW of Modena (184973 inhabitants)
65 Km NW of Scandicci (50609 inhabitants)
68 Km NW of Firenze (382808 inhabitants)
69 Km NE of Livorno (159219 inhabitants)
73 Km SW of Bologna (386663 inhabitants)
76 Km SW of Carpi (70699 inhabitants)
76 Km S of Parma (192836 inhabitants)
94 Km W of Imola (69797 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 4.1
ML-VAX 3.8
1985-01-23
10:10:18
44.14 10.574 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 759
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-01-23 10:10:18 ± 0.276
Latitude 44.1400 ± 0.0216
Longitude 10.5740 ± 0.0383
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 759

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) 3887.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 142
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.04978
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 20
Magnitudes information

Md:4.1

Field Value
Value 4.1
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 759
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:05:59

ML:3.8

Field Value
Value 3.8
Uncertainty
Num. used stations 4
Type of magnitude ML
Reference to an origin 759
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.RBL.Z. 1985-01-23T10:11:42.50 10.0 undecidable manual SN? 41 3.108 -0.32 0
--.BAI.Z. 1985-01-23T10:11:40.00 10.0 undecidable manual PN 121 5.5278 -0.25 0.7
--.FO1.Z. 1985-01-23T10:11:39.50 10.0 undecidable manual SN 31 2.8971 1.82 0
--.TRI.Z. 1985-01-23T10:11:35.50 10.0 undecidable manual SN 54 2.7417 1.44 0.1
--.SGO.Z. 1985-01-23T10:11:34.50 10.0 undecidable manual PN 134 4.995 1.61 0.1
--.ORO.Z. 1985-01-23T10:11:25.50 10.0 undecidable manual SN 309 2.3532 0.63 0.4
--.AR1.Z. 1985-01-23T10:11:13.00 10.0 undecidable manual SN 109 1.8204 0.92 0.4
--.FO1.Z. 1985-01-23T10:11:04.00 10.0 undecidable manual PN 31 2.8971 -0.03 1.1
--.SD1.Z. 1985-01-23T10:11:12.10 10.0 undecidable manual PN 134 3.3855 1.32 0.2
--.BG1.Z. 1985-01-23T10:11:09.50 10.0 undecidable manual SN 339 1.7427 -0.73 0.5
--.RBL.Z. 1985-01-23T10:11:06.80 10.0 negative manual PN 41 3.108 -0.2 2.1
--.RDP.Z. 1985-01-23T10:11:04.00 10.0 undecidable manual PN 145 2.8416 0.66 0.8
--.AQU.Z. 1985-01-23T10:11:02.30 10.0 undecidable manual PN 129 2.7084 0.68 0.8
--.TRI.Z. 1985-01-23T10:11:01.50 10.0 undecidable manual PN 54 2.7417 -0.44 1
--.MNS.Z. 1985-01-23T10:10:56.00 10.0 positive manual PN 138 2.331 -0.2 2.5
--.ORO.Z. 1985-01-23T10:10:56.70 10.0 undecidable manual PN 309 2.3532 0.07 1.3
--.PO9.Z. 1985-01-23T10:10:55.30 10.0 undecidable manual PN 131 2.3199 -0.84 0.7
--.AR1.Z. 1985-01-23T10:10:49.20 10.0 undecidable manual PN 109 1.8204 -0.05 1.3
--.BG1.Z. 1985-01-23T10:10:48.20 10.0 positive manual PN 339 1.7427 0.02 2.6
--.AS1.Z. 1985-01-23T10:10:48.20 10.0 undecidable manual PN 124 1.8426 -1.41 0.2
--.MA1.Z. 1985-01-23T10:10:47.50 10.0 undecidable manual PN 166 1.7649 -1.05 0.5
--.SAL.Z. 1985-01-23T10:10:44.80 10.0 undecidable manual PN 358 1.4652 0.46 2.2
--.FIR.N. 1985-01-23T10:10:39.00 10.0 undecidable manual SG 126 0.6105 -0.73 0.3
--.CH1.Z. 1985-01-23T10:10:38.60 10.0 negative manual PN 116 1.11 -0.91 1.2
--.CA4.Z. 1985-01-23T10:10:32.70 10.0 undecidable manual PG 12 0.777 -1.03 0.5
--.FIR.Z. 1985-01-23T10:10:30.70 10.0 positive manual PG 126 0.6105 0.13 2.6
--.BD1.Z. 1985-01-23T10:10:22.50 10.0 undecidable manual SG 167 0.0666 -0.02 0.8
--.BD1.Z. 1985-01-23T10:10:21.00 10.0 undecidable manual PG 167 0.0666 0.36 2.3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download