Earthquake with magnitude of Md 3.0 on date 20-08-1987 and time 08:32:27 (Italy) in region 1 km SW Fermo (FM)

A magnitude Md 3.0 earthquake occured in region: 1 km SW Fermo (FM), on

  • 20-08-1987 06:32:27 (UTC)
  • 20-08-1987 08:32:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1510, 13.7110 at 5 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
Fermo FM 1 37655 37655
Lapedona FM 7 1166 38821
Ponzano di Fermo FM 7 1674 40495
Monte Urano FM 7 8353 48848
Monterubbiano FM 7 2230 51078
Moresco FM 7 598 51676
Porto San Giorgio FM 8 16121 67797
Altidona FM 8 3390 71187
Sant'Elpidio a Mare FM 9 17110 88297
Torre San Patrizio FM 9 2048 90345
Monte Giberto FM 9 801 91146
Rapagnano FM 10 2145 93291
Grottazzolina FM 10 3398 96689
Magliano di Tenna FM 10 1452 98141
Petritoli FM 10 2335 100476
Montegranaro FM 11 12990 113466
Montefiore dell'Aso AP 11 2123 115589
Campofilone FM 12 1916 117505
Monte San Pietrangeli FM 12 2458 119963
Pedaso FM 12 2800 122763
Porto Sant'Elpidio FM 13 26152 148915
Monte Vidon Combatte FM 13 433 149348
Massignano AP 13 1638 150986
Carassai AP 13 1100 152086
Monte San Giusto MC 13 8191 160277
Montottone FM 14 979 161256
Montegiorgio FM 14 6851 168107
Francavilla d'Ete FM 15 964 169071
Belmonte Piceno FM 15 646 169717
Monsampietro Morico FM 16 659 170376
Ortezzano FM 16 774 171150
Monte Rinaldo FM 17 379 171529
Ripatransone AP 17 4309 175838
Civitanova Marche MC 18 41983 217821
Cupra Marittima AP 18 5398 223219
Cossignano AP 19 978 224197
Monteleone di Fermo FM 19 395 224592
Monte Vidon Corrado FM 19 731 225323
Mogliano MC 19 4696 230019
Massa Fermana FM 19 963 230982
Servigliano FM 19 2336 233318
Montecosaro MC 20 7113 240431
Corridonia MC 20 15430 255861
Montappone FM 20 1682 257543
Falerone FM 20 3337 260880
Montalto delle Marche AP 20 2122 263002

Municipalities with at least 50000 inhabitants

An earthquake occurred to
54 Km S of Ancona (100861 inhabitants)
55 Km N of Teramo (54892 inhabitants)
79 Km NW of Montesilvano (53738 inhabitants)
85 Km E of Foligno (57155 inhabitants)
87 Km NW of Pescara (121014 inhabitants)
92 Km N of L'Aquila (69753 inhabitants)
95 Km SE of Fano (60888 inhabitants)
96 Km NW of Chieti (51815 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 3.0
ML-VAX 2.7
1987-08-20
06:32:27
43.151 13.711 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 54239
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-08-20 06:32:27 ± 0.303
Latitude 43.1510 ± 0.0173
Longitude 13.7110 ± 0.0230
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 54239

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) 2679.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00372
Epicentral distance of station farthest from the epicenter (degree) 0.02914
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

Md:3.0

Field Value
Value 3.0
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 54239
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:52:18

ML:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 54239
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 Takeoff_angle Residual Weight
--.HVA.Z. 1987-08-20T06:33:25.60 10.0 undecidable manual SN 87 0.0179 -1.11 0
--.CTI.Z. 1987-08-20T06:33:18.19 10.0 undecidable manual PN 333 0.0291 -0.64 0.3
--.MNS.Z. 1987-08-20T06:33:05.00 10.0 undecidable manual SG 224 0.0096 0.15 0.4
--.HVA.Z. 1987-08-20T06:33:02.30 10.0 undecidable manual PN 87 0.0179 0.64 0.7
--.ASS.Z. 1987-08-20T06:32:55.00 10.0 undecidable manual SG 263 0.0070 -0.28 0.4
--.SDI.Z. 1987-08-20T06:32:53.31 10.0 undecidable manual PN 176 0.0130 -0.77 0.3
--.MNS.Z. 1987-08-20T06:32:48.98 10.0 positive manual PG 224 0.0096 -0.05 2.2
--.AQU.Z. 1987-08-20T06:32:45.00 10.0 undecidable manual PG 195 0.0074 0.56 0.5
--.ASS.Z. 1987-08-20T06:32:43.36 10.0 positive manual PG 263 0.0070 -0.15 2.1
--.ARV.Z. 1987-08-20T06:32:41.59 10.0 positive manual PG 301 0.0059 0.31 1.8
--.CM8.Z. 1987-08-20T06:32:36.78 10.0 negative manual PG 275 0.0037 0.04 2.2
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, http://terremoti.ingv.it/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